Okay, so thanks to the advice and guidance of mrpackerguy, I determined I was all F'd up in the way I was setting this amp. When I followed his advice, I got more than enough power out of it! At least I was shaking crap off the walls and the cats were squalling in pain!
So I think I'll put this one off the market, at least until this time next week. Got a big gig coming up and I'll see where it takes me then. Suspect I'll have more than enough juice now that I've pulled my head outta my butt!
Thanks again to mrpackerguy and for all the interest! But feel free to check back later, you never know. GAS is a terrible thing