Let bombers dash and use their shields while charging their bombs.
Bomber Buffs
The main reason I'm suggesting this is because I think it would make it more fun, bombers would able to make more risky plays by dashing in opportune moments in the middle of all the chaos to get the most out of their bombs, while also being able to defend themselves. Right now I feel that bombers are really hurt by not being able to dash or shield since at least the other weapon types can basic attack and kite enemies, bombers are forced to use charge attacks to do anything and they are really vulnerable during that time (especially without CTR). I haven't played too much bomber so I might be wrong on all this, but it's because I find it so boring (especially without a complete set) that I haven't played it much in the first place.
Being able to shield while charging completely might be overpowered, so perhaps make it pause the charge when shielding? If you charged it to 70%, then shield, the charge would pause there at 70% while holding your shield, and the progress would only resume after releasing your shield.
Honestly I don't know what buff would that be, since sword and guns can't dash nor shield while charging... is intrinsic to the mechanic, bombs could use a bit more damage, but then again some Bombs Don't care about damage... and some bombs make levels trivial... I understand that You think Bomb are lactustre but it because the gameplay is merely different.
This is a topic for a Long evaluation a simple answer might not be usefull since a more complicated and deeply one is needed. A conversation needs to happen, perhaps here is where It should start.