I shouldn't have said bubble. It is the tread pulling one way or another. Thank you for your comments. It helps to know that others have had a similar problem. Even when the tire is off the wheel the tire pulls more from one side then the other at differing spots. Your suggestions are good ones. I've even pulled the tire and measured from the edge of tread to the bead and found as much as 1/8th of an inch difference around the tire. I'm clearly an amatuer, but I have changed my share of tires and I've never had this problem before. I think that maybe I need to back away for a while and give it a rest until I am fresh again.

Thanks again.