[jonnyk]

That sounds AWFULLY high to me for 93 octane and such high compression and boost. I would be leery to run more than about 18 degrees total timing. I have mine dialed in at 20 degrees probably seeing around 10 pounds of boost on 91 octane and 8.4:1. Start low and work your way up, not the other way around! Unless you're not averse to regularly changing head gaskets or risking melting pistons...