Hey Scott

I've had good luck with both Yamalube 2r at about 36:1 and AMSOil as high as 75:1, although at the high end of this, there isn't a lot of room for any mixture mistakes.

Generally, setting the low end at around 7/8 and the high end at 1-1/4 will work. There is a spot where the two interact and you can lean the top end very slightly and affect the hover setting, depending on the RPM's you run. I'd suggest setting the top end around 1-1/8 and see if it gets the twitch out.