I know, this buff stacking system of theirs is annoying. For instance Tacticals on Space and Ground can 1-shot players with buff stacking. Engineers got Shield Resistance stacking, and Science has Heal buff stacking. But in other MMOs, its not necessary, 1 for attack, 1 for defense is all you needed.

And in all honesty, I doubt Cryptic is even going to even think about tweeking the system without angering the PvE base, even if it mean making Combat actually challenging.