looking good, probably have to play with the balance factor of the crank or counter balancer to find what feels best in your chassis dynamics along with crank balance factor/piston weight setup
What year crank is in that motor, I know some year cranks do not have the counterweight exactly 180 degrees from the rod pin. I have a factory 86 crank that when it sits in it the cases it rolls the crank pin to about the 1:00 position where my other cranks both cr500 and 250r, the cranks will sit at the 12:00 position