RCU Forums - Problematic 110FZ

Dave:
My 110 has been problematic since new (started running it in the spring of '05). I hope you can help me figure out the problem. First off, here is my setup:
OS #F and YS plugs (tried both over time)
APC 16x6
Coopers 30% nitro Plus fuel and Powermaster 30% heli fuel (both over time)
Recently replaced original large-head plunger with 91FZ plunger, and replaced diaphragm.
Dubro tank, holds pressure fine. Profile plane with exposed tank, so no fuel T's, just 2 lines to the tank. Valve clearances set recently.

The high speed needle seems to work fine, high end is easily adjusted. But the regulator and low end screws seem to have little effect on performance. Often the motor quits when at idle. A fellow flyer, who I would consider a YS expert, thinks that its starving at idle. He has tinkered with the settings on many occasions. Right now, we have the regulator set very rich compared to normal settings (its screwed pretty far out), and the low end is almost bottomed out rich, and still is seems to starve. At mid throttle, I don't see nearly as much smoke as another friend who runs the same plane, prop, fuel, and plug on his 110. Mine pings sometimes in flight, as if I'm running too much prop – perhaps this is more evidence of a lean condition? This motor should be tearing up a 16x6. Is this a manifestation of the dreaded "regulator problem" I've read about? What suggestions do you have for me?

Thanks,
Kurt