Thanks for the feedback. Nice to hear that the form is overall solid. Yeah, it was a hell to grind it up.
But I agree I'm probably too slow on the negative, probably leading to slow speed on the way up. I think it could be because of several reasons. When the weight is heavy it feels scarier to go down fast, I have recently done a lot of pause squating and I was a little bit concered about the depth and maybee therefore taking more time to really feel that i have reached the right depth. Will try to train to get a better rebound out of the hole. I don't see speed squats so often mentioned but that could also be an idea to test.
I tried 180 kg too, it was also slow and a little bit more shaky in the middle but but the depth was a few cm higher so I considered it not acceptable as a pb.