...I only had two stroke plugs. Tried an OS 8 and an OS A3 just for fun. The A3 wasn't too bad, but I couldn't get steady rpms at full throttle. My LHS sells Enya #3 and #4, are those worth a try? Other recommendations?

One thing that I noticed is that there is about a quarter of a turn on the HSN where there is practically no change in rpm. I have always tuned my engines towards the rich end of this "flat area", but if I go towards the lean end the midrange is better. It sags slightly when I point the nose up and shake the plane. Until now I have thought of this as the "warning area" that is slightly too lean. Comments?