Reset your idle air gap at .5mm. Then you will find that four
turns out out on the low speed needle is still at little rich, so
lean it some from there. Running the idle air gap at .7mm to
.8mm will cause you problems. The one thing you will really
notice if the idle air gap is too much is a two stage idle down,
after a wide open throttle run.
Also, as far as pipes go, try a Jammin JP-3 pipe out on that
engine. I know, even I don't care much for the JP line of pipes
on any engine I own. But the JP-3 really wakes this engine up
and the engine temps didn't jump up twenty degrees, like I have
noticed happens on other engines. I never liked the 2045 pipe
on an engine that I've ran it on, RB's included. I have always
found someting better, without sacrificing much run time.