Ok. right now i have a 350 watt head. its running 200 into my 8ohm cab. i need some more power cuz or guitarist liks the scooped midrange and cranks the lows. i got him to come off a little on the lows. but he still cranks. so, by getting another cab i can run ALL of my 350 watts. will i see a huge jump in power? and if i get another cab, what would you recomend? i want your baised opinoin. i play heavy stuff mostly. i have one 4x10 cab right now. i was thinking of a 15' cab. but maybe another 4x10 cab would help me cut better?