My OS 32 pulses badly on descent from FFF. I have tried both the stock TT muffler and a Century 3033. The high speed needle is set at 1.5 turns out. I just can not seem to get rid of the pulsing. Is this a lean or rich condition on the low end needle?? Any suggestions. My head speed is about 1800 using a TJ pro. This condition occurs either with the gov on or off.