This sounds like driver flex (all sets you mention have dynamic drivers). Open your mouth wide when you insert them and that could help. As for long term comfort, I can't do anything about that but the kz starline tips are pretty comfortable to me versus most other silicon tips. In general I just find that foam is much more comfortable over time. Overall, I have the same issues with silicon tips and dynamic driver sets. To test to see if it is flex, try the same tips with something with only BA drivers and see if you can replicate it, if not, it's driver flex. BA sets won't do it.