Try leaning the low end needle about 1/4 turn. Then try acceleration from idle to about 1/3rd throttle. If the engine gasps, then it's too lean. Keep leaning the low end needle and recheck acceleration. When you get snappy acceleration, the low end is correct. After setting the low end, readjust the high end needle for full throttle max rpm with a tach. Then open the high end needle slightly so the max rpm falls by about 100 rpm. This insures that the mixture is not too lean. Test fly. Make sure it doesn't sag in the verticals. If it sags, richen the top end needle slightly.