Kenda Bear Claw HTR way out of balance

I just got a new set of 26x9x12 in the front and 26x11x12 in the rear. I actually have a new King Quad 750, but this forum is pretty active and I end up reading quite a bit from here when I google search.

I just got these on and they shimmy pretty horribly on the road above 25ish. They also seem to make the steering really twitchy. Anyway I took them to a tire shop and they reluctantly put them on a tire balancer. He was going on about how he never heard of balancing atv tires, and was making all kinds of comments and being a general a-hole. He put one tire on the balancer and said it was so off he would never get it to balance and wasn’t going to waste his time trying.

Has anybody ever used the balance beads Apparently there are some that can be put in through the valve stem.