Guess my Hp and Tq

I think part of the area you lost power was in your fuel selection. You're only at 11.3:1 (IIRC) so fuel with that high of an octane rating is not necessary. If you were still on cast iron heads, maybe, but not so much with aluminum since they dissipate heat better. I think that's the reason your timing wound up so high, to try and force the fuel to burn. Since you have a Pro Systems carb, call Patrick and ask him about it. I'd be interested in what he'd have to say.