03 LT50A Jetting Issues

I have an 03 LT50A with the intake and exhaust restrictors removed i also drilled six 3/8 holes in the airbox cover until i get a K&N filter installed. What i need to know is if anyone out there that has made similar changes has any advice on jet size. I put a 60 in it but its still too lean tried a 90 it was too rich. I would like to remove the oil injector, would 32:1 be the correct mixture and what will removing the oil injector and running premix do to the jetting.:confused: