so i have been playing my backline 600 (300 watts) through my avatar cab 4 by 10 (4 ohms). I run a ratt pedal through it too. recently the head has started to red lining (?) and clip, the red light would come on couple seconds then i could play again, it also cut out to a low growl volume level for a second yesterday. Im not sure if i have done damage, but im woried its on its way out. Im looking for a new head thats got some punch to it. What watt should i be looking for too? any recommendations on amp heads?