I'm running an O.S. .46AX stock muffler about a gallon through it and it does not transition nicely from idle to full throttle, (its on an ex-treme 330 profile, 3D type flight) and I need better throttle transition. The high-end needle is still set a little rich, but I'm not sure if this is an idle adjustment screw problem or what, I haven't had to mess with these in the past on my other O.S. engines. Thanks for any response