SatKartr,

You shouldn't have to be fooling with crossover settings to see if it helps at this point. That beefy amp you have should Not be shutting down. My advice is to look into getting a replacement, so you'll know for sure whether you've got a bum amp.

Epic 80 / SVS PB13 Ultra
Denon 3805 / M2200 Outlaw Monos /
Sammy 55" LED