Ooooh, nice and fast. I like it. ^_^
One thing I will say (to piggyback off of D1's great summary) is
YES to not doing a DJC up air on opponents who are doing a rising attack. For floaties at low percents, do a forward air. For floaties at mid percents, you can do a slow falling down aerial to rack up the damage needed for a KO move/edgeguard. For floaties at high percents, forward air again is good, since it will probably KO off the top and nobody ever seems to DI this move (though it doesn't help too terribly much). On different character types, you can try different things, like for heavies (Link/DK/Falcon) if you see their getup attack starting up and you're on a favorable side, you can stand close, wavedash out of their attack range, and then wavedash back in with a downsmash for a pretty clutch hit. All these depend on speed and foresight and the usual Yoshi stuff, so be careful, but be creative, too. Trust me, once the enemy gets the hang of your DJC, it's not fun times, so try not to do that same DJC up aerial so much.
Speaking of DJC, I like your use of it offensively aside from the getup attack counter. One thing I would like to see is if you could use its defensive properties to go through attacks. Mewtwo can be especially annoying with his neutral air (even though you don't have the best options with a DJC, it's better than being dragged along into whatever he has in store for you later). DJC through his forward tilt and forward air for a free neutral air kicks or maybe even a down aerial if he's close enough.
And yeah, more eggs, if you can. You seem like a melee Yoshi, though, so if it's not part of your style, it's okay, but once you start fighting actual characters (like the ones you plan on countering...Marth/Peach/etc.), you'll find eggs are pretty invaluable.
Yeah, that's it for me.