150 probably doesn't even get you close, tbh. You can still use all the combos. For example I use a lot of chainsaw and ram-whip, entrap-swing, and snaptrap, and grasping hand in my alerts/dailies. In raids I tighten it up for maximum dps but I'll still use combo lightblast/minigun for doing damage while on the move. Your combos should be hitting for much, much more than 300 and 400, though. What's your might?