The cg is equal and the seesaw balance is perfect on the Heli-Max ball bearing blade balancer. That's not the problem. I think i'll tear the head down and check the bearings, and make sure the thrust bearing are not backwards.

If I don't find a problem there, I'll pull the new main shaft and check to see if it's straight. Shoulda' done that before I installed it.

Thanks for the suggestions.