New tyres fitted- atv wobbles

Hey people,
Today i fitted 4 new maxxis ceros 26-09 26-12.
The bike wobbles like crazy after 30mph post balancing.

The front tires needed 6oz (around 180grams) each and they were balanced.
The rears needed 16oz(!) each and they couldn’t be balanced, the weights would not fit in the rim the shop told me.

They told me to wait a few miles for the tires to break in (but also not get my hopes high) or talk to the dealer that i purchased them from, for a refund or something.

Also i noticed they are a bit out of round so i inflated them to 30 psi and jacked up the bike for the night(although i don’t think that will change anything but you know).

Is it normal for radials to be so much out of balance?
If i could get new more balanced tires i would prefer it over lots of weights balancing beads etc.

:th_smiliepullhair: