Okay, I've watched all 3 videos and here's what I think
Firstly, here's where i disagree with the above posters.
a) You're not using specific moves too much, youre just using MOVES too much.
b) You're not dashdancing too much, you're not dashdancing ENOUGH. Dashdancing is extremely useful with Bowser, as I'll explain later.
c) Bowser's wavedash is certainly not something that you should spam (see point A about not using moves too much) but it does have its uses. (Platform landing to approach, wavelanding to mindgame, wavedashing out of shield to punish).
d) Don't think about your techskill. Obviously your techskill is imperfect, as is everybody's. And obviously, you should TRY to perfect it. But to say that you should work on your techskill is misleading. Your techskill is as good as it needs to be, and you really need to focus on other aspects of your gameplay.
As I see it, here are the problems with your play:
1) TOO MANY SHFFLs that dont contact. SHFFLing fairs and bairs seems to be your only method of approach, and it is not a good approach. You don't need me to tell you that all someone needs to do to counter that approach is to SHIELDGRAB. And even if they don't shieldgrab, SHFFLed fairs that don't contact leave you VERY open to being punished (a shffled fair is FAR laggier than you might think it to be).
The solution: Intersperse DASHGRABS with your shffls. Honestly, dashgrab is probably bowser's best approach. It's very fast, it has great range, and it can lead to many other moves. If you're facing into the stage, try a backthrow to get them off the stage and into a vulnerable position. If you're facing away from the stage, try a downthrow to techchase or follow with a fair. (Obviously these are generalities so don't adhere to them religiously).
2) TOO MANY EMPTY SHORTHOPS. Bowser's shorthop is FAR too slow to be spammed, and it leaves you very vulnerable. Do you ever think about why it is that, when people are being juggled (say, by Fox's upairs) they want to get back on the ground? It's because being in the air is a very vulnerable position. Now why would you want to put yourself in that position voluntarily? Just don't do it. I'm not saying that you should never use empty shffls, they can definitely be a good mindgame. But most of the time you're much better off staying on the ground.
The solution: Well, obviously, DON'T use many empty shorthops. Replace them with dashdances. You are MUCH better off spending time dashdancing than spending it doing empty shorthops or shffled fairs. Why? Because when you're dashdancing, you're baiting for openings and setting yourself up for a quick punish (with a quick dashgrab or a shield to up-b or something like that). Also, you are simply much more secure while you're on the ground. On the ground, you can SHIELD, and shielding is very important to bowser's game (given his amazing up-b out of shield). When elvenarrow said "Really though, I don't think you have any business wavedashing or dashdancing there, because neither is really useful for Bowser in terms of spacing," I think he meant that you can't use Bowser's dashdance in quite the same way that you use other characters' dashdances. What you have to realize about bowser's dashdance, is that more often than not, you will NOT avoid an attack simply by dashdancing. What you need to do is dashdance, and then either SHIELD or FORTRESS as soon as you think you're going to be hit (shield against most attacks, fortress away against grabs).
3) Crappy Recoveries. Okay, I lied before. There is ONE aspect of your tech game that it is absolutely crucial for you to improve: your DI (you should NOT be dying to M2's backthrow on FD until like 200%). A bowser without good DI is... well I don't know what it is but it's not a bowser. Improving your DI is a prerequisite to improving your recovery, because having good DI gives you options. Luckily for you, Bowser is the easiest character to learn DI with. Because all of his moves are so laggy, you can anticipate being hit after you missing virtually any of them, and you can prepare to DI accordingly. Okay, I've gotten a bit off track here, but it's all relevant.
The solution: The key to a good recovery is fooling your opponent. This, i'm sure, is self-evident. In other words, you have to ALWAYS provide yourself with options (this is where good DI comes in). To recover, a good bowser will DI well, float for a while, then jump and up-b at the height of the jump. Furthermore, a good bowser will position himself so that he has a few options even after starting his up-b. Now, when elvenarrow said "Aiming for the ledge is always a good policy," don't take this literally. There were many situations in your videos where you could and should have recovered to the ledge. Bowser is VERY secure on the edge, because he has a bombass getup attack. If your opponent knows bowser, he'll stay clear away from the edge to avoid that getup attack. At the same time, you should NOT make a habit of only recovering to the edge. If you make a habit of recovering to the edge, any good player will abuse that and just edgehog you every time.
I would say that a good starting point would be to switch between recovering to the edge, and recovering as far into the stage as possible. Recovering far onto the stage is great because most players will rarely anticipate that bowser can recover as far onto the stage as he can, and as long as they don't get to where you are BEFORE you hit the ground, you can just up-b as soon as you DO hit the ground (due to the nearly nonexistent lag of landing an up-b). More often than not, this recovery allows you to punish them, rather then letting them punish you.
Okay, those are the main problems in my opinion. Mainly, you just need to stop spamming moves.
I definitely went through the spamming phase, and it's just something that you've gotta train yourself to not do. If you play with better players that are good at punishing that sort of thing, it'll force you to adapt. What helps me is to separate a match mentality from a training mentality. While training, you can go crazy with all the shffls and fortress hogs and bowser bomb hogs and all that. While you're playing a match, settle down and play smart.
That was a bit long-winded, but I hope it helps.