sent you a pm, Sounds like the carb is off, I was never entirely happy with the way the Keihin ran on my machines, with all the time I spent I never got It just rite, always close but pushing a dead spot around.
 Also with the combination of parts your running you might be happier with boring your stock carb a little, the trail port, the rad valve, both of those are restrictive and Like a little less carb,

With a Rad valve and big carb you get a pretty bad mismatch in the intake tract, that a carb wont deal with well. The carb should be the smallest part in that portion of the intake, not just after it in the throat of the rad valve. There should  should only one restriction and that should be at the needle for correct carburation.