CjM420

Okay i need some true professional help from the man himself. Im running 2 rockford fosgate p2d412's with a 600 watt lightning audio 2ch amp at 4 ohms bridged. I usually listen to it with the volume at 20 or so but if i turn it up to 25 my amp clips and my HU turns off and on real quick. What can i do to stop it from clipping? I'm getting a capacitor but i dont know if that will solve the problem totally? Any suggestions on how i can make my system sound and work as good as possible would be greatly appreciated.