I want to say first off, I have not used the Mad Bomber set and I don't necessarily think there's anything wrong with it, but I had a neat idea and I figured it would best fit this set. This would replace the Negative Status Effect Resistances, you will see why.
The IDEA:
Premature Detonation
If any hazard, enemy, or other interruption hits you while Bomb Charging, your Bomb explodes. You, and any enemy around you, takes damage (but not teammates, duh). In my mind, this means Shock could cause the explosion, but not Burn.
Equipping one Mad Bomber item= 25% self damage, 50% enemy damage (relative to the bomb's normal output)
Equipping both Mad Bomber items = 50% self damage, 75% enemy damage ( " ")
In the case of Status Effect inflicting bomb, you will have a chance to Inflict that status on yourself!
This is the main reason why I think the negative status resistances would have to go if this was implemented, it will be punishing enough Freeze / Shock / Burning / Poisoning yourself without the negative resistances.
u know how much a bomb with mad bomb set hits on a player? 2 bombs kill u off, so 1 bomb with mad bber set is 1/4 of your life, w8 that would be about as much u get with low hits in tier 3, ok.