Thought I would chime in. I've had this engine for this season and there has been a learning curve for sure. I agree the the Cool power 15% with 17% oil synthetic is a great fuel. I have found on a Temptation that the APC 17X10 regular is the best. I have the macs header but I switched from the Piedmont sold greves to the Webra 1100/260 pipe. The thing with mine is that it ran poorly until I put in the mixture control carb that they sell. It's a little tricky to set up but does it take care of the transition problems. I turn 8500 RPM with my combination now and that is a lot of power for sure! The 1 problem that I've had that really killed me up until about a month ago was a faulty YS check valve on my vent line which I had incorporated with a fuel T for filling.
Good luck, Mike