Interesting..
@Galaxy BrainI agree with the premise you are putting forward.
Initial random brain dump (not thought out):
Increase perception range of targets
Increase reward for team of six rather than eight (likely mission completion reward)
Raise AoE resist slightly for LTs and Bosses across the board
Add taunt to AoE (AoE russian roulette solved by controls)
Raise AoE def significantly for random Bosses
Anyway. raising HP is just increasing button munching. Something more elegant that could require recognition and reaction would be preferred.