Just for future info....I know it doesn't matter now with the warmer weather...
My rear wheel has always required lots of weight no matter what tire brand I used...The wheel it self is badly balanced.With the ride on in it is better than ever.
84°F during installation. Both tires are new with only a few hundred miles on them. The guy who balanced the rear has some kind of antique spin balance and said he couldn't get it dead on. I left the weights on both tires.
I had a puncture in the rear tire, last trip, coupled with an out-of-round front it made for and interesting ride home. By the time I Slimed the tire it was beginning to de-laminate. I'm hoping to head off another such incident.