Bombers are a unique kind of fighter, most of the battle they spend their time charging their which leaves them open to attack. Gunners can use their charges at a safe range while swords tend to have immediate damage and knockback when they use their charge attack. Bombers have a lower survivability rate for several reasons but one of them is that their armor gives them the same defense as the other class armors.
http://wiki.spiralknights.com/Volcanic_Demo_Suit
http://wiki.spiralknights.com/Vog_Cub_Coat
http://wiki.spiralknights.com/Nameless_Poncho
I propose giving bombers 10% more Normal and Type defense (they are all elemental now but who knows if that will change), or +1 more HP than other class armors when fully heated.
OR
Make the other class armors weaker by comparison (10% type and normal), or 1 less HP than bombers when fully heated.
i prefer that bombers get buffed, than other claases getting nerfed. I believe more that bombers should receive like at least more damage.