Yeah, even OS's need a little fine tuning once they are "broken in". Getting both the high and low speed needles can be a pain but it's necessary and worth it in the end. All of my AX's fly just fine, but I did have a problem with one of my .75 AX's dead-sticking occasionally, and I made a few minor adjustments and it seemed to stop. But, that could have been just about anything.. piece of crap in the line, a stuck clunk, both of which could have cleared on themselves. It's hard to say.

But adjust away, but remember very small adjustments in the low speed needle produce large changes in performance... so do these in small increments.

CGr.