Smart frame on KICKR Core wiggles excessively

Hi all

Have been riding the Zwift smart frame on KICKR Core for about a month and thoroughly enjoy it - with one exception. Even thought I have tightened the throu axle as much as possible, it still wiggles from side to side on the trainer. This is especially disturbing while standing up and in low, hard cadence. I have considered finding some sort of spacer and see if I can fit that in somewhere, but before I start to make hacks, I would like to hear if anyone else experience this on their smartframe?

Thank you for any insights, tips or tricks on this.

Anders