I think you need to learn how to shift/move the shift levers better then you do now. getting the feel of how far to move which lever to make how much of a shifting possibility is, like other aspects of coordinated movement, a learned practice.

Kind of like when Grip Shift first came out and riders tried it without previous experience. Many complained about shifting imprecision, massive wrist movements that interfered with their grip and the inadvertent shifting when "working" the grips strongly.

You got past these issues with Grip Shift, now you need to get past the lever shifting differences. Andy.