After using more moves, I really like Gunner Missile, Cannon Uppercut, and Bomb Drop again. At this point, I'm going to be using almost all of Gunner's specials depending on the MU. Even laser blaze isn't that bad.
Gunner Missile is super laggy with homing attacks and it's pretty bad in a vacuum, but the homing is better than Samus' and it's not *too bad on the ground when used with the other projectiles. The super missile version helps covers Gunner's long range options easily, it deals good damage, and you can combo/trap off it safely. Still suicide to use offstage afaik, so it's pretty difficult to use with Arm rocket when you need to angle the upB, that 1% screw up chance can be deadly later on. The other sideBs are nice, but I'm really in need of something for long range when mid-range is covered by pretty much everything else just fine.
I tried using cannon uppercut again recently and I like the move now. I thought it was a little weak before and didn't make up for its recovery, but it's still an option. Now that I learned how to cover myself when returning, having a hitbox above me with my upB is reassuring, and I believe it still has invincibility frames when used in the air.
What turned my opinion around with cannon uppercut was its edgeguarding use. You can run offstage and upB and you'll snap to the stage while releasing the spike part of the hitbox. Next to the ledge, it can also spike people trying to snap. This makes the area under and directly in front of the ledge much more dangerous since you can spike them with upB with relative safety. You definitely can't go as deep as you could before, but that's not really needed when you have so many projectiles.
I too thought that bomb drop was redundant, but after thinking about it more, it covers all the gaps left with grenade launch. It comes out a bit faster (even if the explosion takes a short while to trigger) and covers the area immediately in front and below. Not only that, but you can combo off of this move, too. It's similar enough to grenade launch to be great while covering a few more options, helping you mix things up.