Link to original page on YouTube.
Just watch from 0:13-0:19
What helped me figure this out was to isolate the braking fingers from the throttle grip fingers. This is also why I chopped my stock levers. The long lever would pinch the fingers on the throttle, in between the throttle and lever, and make it difficult and painful to twist the throttle to rev match/downshift.
This is very similar to trigger finger control when shooting a gun - mentioning in case this is something you do.
Really good suggestions up top, so I won't repeat them. 
__________________________________________________
My therapist has 2 wheels and a seat.
If you are ever in doubt to my tone, please refer to my avatar.