Bud when adjusting dont make adjustments of more than 1/4 turn at a time.
For the 2 speed a good starting point is to have the screw heads just below the lip of the hole and not sure if you done this but check that the 2 screws are not on the verge of coming out the other side.We usually shorten the screws by a mm or two.Also put loctite on the grub screws that adjust teh play on the 2 speed cam.
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