Hi all, Just wondering about tuning and if i am doing it correctly. I have a .21 novarossi 9 port with ceramic bearings in my mrx5 WC spec and i have idled it through around 6 tanks and drove it at the local car park. All is brand new. I am very pedantic about having it sounding right and making sure there are no lean fuel mixture sounds. When i punch the throttle, it operates perfectly and very punchy. However when i am at a speed and not wanting to slow down or speed up, i notice it sounds like it is leaning out and doesn't sound healthy at all.... Any suggestions as to what i can do to fix this??
I have tried making it richer on the high speed but it doesn't really help that and the idle screw a fraction. This worries me. I am wondering if because it is built for racing and i use it as a hobby that it either wants to go or stop instead of in between. Any advice for tuning would be great and would be appreciated.

Thanks