None of my OS engines [.10-.40] have ever needed much "needle work". The high speed needle might need a couple clicks one way or the other, but that is discovered when the plane is in the air during a high speed pass. There are many days when nothing gets touched, just "gas and go".
For the most part, the less you mess with these engines, the less you will have to mess with these engines. I see guys eagerly tweaking their engines right after start up before the engine has had a chance to fully warm up. ABC, ABN engines like to be fired up and ran hard ASAP, not left to sit and idle cold. Point the nose of the model straight up at WOT as part of your ground check, also. Let's see what this thing can do in a worse case before it has to in the air.
Seeing to it that all the screws on the engine are snug, the muffler, NVA and carb are snug and that the fuel tank and lines are well padded and in good shape is the main thing.