When UR is up, marauders cannot receive any healing.
Remove the stealth part of the aggro dump marauders get but keep the damage reduction and the speed boost if talented.
That's all it would take to fix it. I give you props for actually making a reasonable post.
As I recall, the main complaint was getting killed by a Marauder while he has UR on (frustration of not being able to kill them before he's healed up seems to be a secondary concern). Why not just reduce damage done under the effects of UR by 50% and call it a day? Or give all attacks - Force and melee a far 50-70% accuracy penalty?
I like stealth the way it is. It's the only way to get a crack at a good sniper.