I'm inclined to agree with Earlwb.  Try richening up the high speed needle a 1/4 turn and see what happens.  Good that there is some Castor in the mix to take care of those "potential" lean runs.

I would were I you up the oil content too.  All the old gurus here say use 20% total lubircant (oil).  That you can get away with 17% is your choice, that means a tad more performance but also a tad less lubiricant through the system.  Yes, I know some that even run 10 or 12% lubricant but at what risk?

Chip