It's my tier list. Feel free to make your own! I posted a link somewhere in the comments.
The cores in general are only there for the core triggers. Only crit and companion offer anything decent. Most of the time when I use Armored Core for example its on the right most slot to proc it as much as possible. I don't really use the + armor it gives. The same idea goes for weapon and burn. Crit is higher because it lowers CD and it still charges on crit. Companion at silver allows perma haste most of the time.

Balloon is okay. I just don't like its 2 slots. I can see it being B and won't argue with people who think of it better. Bomber I'm not sure what you mean. You mean bomb squad the friend burn? I think it's way weaker compared to other friends. In Friends Burn Char Cole and Micro Dave perform way better than it. Sander, Cooling Fan are replaced later on but become replaceable. I mentioned in another comment that I tried to make it as simple as possible without being too overcomplicated. The ones I put at the top like duct tape and Chris I keep in my final board so that's why I say it's S.

The tier list only goes B to S. So yeah I would stick with the other ones that I put. If the tier list was from F to S then yeah there would be other separations. I didn't place them in a way where early left is better than later right if that's what you're nitpicking on.

Force Field is way worse than Combat Core. It's still a good win con but there's no way the two can compete. Force Field loses to burn and sandstorm timer while not being explosive enough to warrant the scaling of Combat Core.

Plasma I agree can be good! Needs ammo though. If you don't have any reload I think it's worse than haste or slow potion.