LoL....why didn't you just remove the rear needle assembly all togehter ?

well..you can't blame it on the engine just becuase...you don't know how to tune it.

I don't have problems with .46 or the .52 magnums

well, have you replace the glow plug that you used to break the engine with at least?

Did you wrap the fuel tank with soft foam to prevent foming cuazing bubbles therefore cuasing you to get hot and die.

It just depends. I can't be sure becuase it's a bit tough to tune an engine over the net.lmao.
Mostly likely I'd adjust the Low speed from the symtoms you're discribing.

In other words...it might be too lean. it runs fine on the stand or ground..but you need to richen it up
to compensate.
Therefore the lowend will get a little slugish..so you might need to adjsut it a tad.

If you let the enigne idle for a little while with the modle on the ground...you have to clear out the oil in the muffuler.
if you let off from WOT then to a slower throttle setting...this to will build up oil in the muffuler...therefore causing a slugish excelleration.