As far as leaning the low end goes, this is what I did. Lower you throttle to a stable idle, being very careful(ie. plane and engine are not going to move under any circumstances) lean your low end needle 1/8 turn. If the engine RPM increase when you do this(this means your too rich on the low end), lower your throttle to a stable idle again, and again lean the low end needle. Check your transision to high speed between each leaning of the low end. Continue this process until you have your most reliable low RPM idle. You will probably have to readjust your high speed needle after you complete this process. Since this engine is new, I would adjust the high speed to about 400-600 RPM rich of peak RPM. This should keep everything well lubricated. After about a gallon and a half to 2 gallons, you can adjust your high end within 300 rich of peak RPM without any trouble. Also as I said before break in will greatly improve your idle.

Hope this helps

Allan