One thing.
I know my tank is holding pressure (at least I think it is). When I called it quits, I let it sit for about 3-5 minutes. When pulling the vent line off to release pressure, I hear the air escape. There could still be a slow tank leak. Could a slow tank leak cause this?
It sure sounds like the high end is lean even though I try it at 2 turns out and it dies.

for some reason 3 1/2 turns out sticks in my mind as to where I used to fly this engine with 30% nitro. But that does not seem right from what I've had others tell me.