Sprinting on trainers

Not sure if anyone has similar experiences, but my Flux feels a bit unstable sprinting, so not really keen to do proper 1000W sprints.

For those of you who find their trainer stable for these kind of efforts - what do you have?

Could this be more of a technique issue?

Agree with @Supermurph19. Sprinting on a trainer is almost nothing like sprinting outdoors. Almost any trainer will feel super unstable if you even use 10% of the upper body English that you do outside. 1000W is a lot on the trainer so I would slowly work up to that and get comfortable at 600, 700, …, until 1000 feels better.