Your CEZ stage is absolutely ridiculous in terms of difficulty and you need to tune it way, way down. There is absolutely no margin for error and that makes it absolutely unfun and aggravating.
You should not have rings until after the first two or three sets of bumpers. It is not possible for the player to see them.
Don't spread the rings apart literally in the middle and then at the very end in the following segment. It's insane to expect any player to be able to do that accurately. If you really, really want to do that, save it for SS7 and absolutely make sure that the player can still beat the stage without requiring literally perfect precision.
Make your ring requirement proportionate to the stage number and rings in it. 100 is absolutely ridiculous in SS4 here.
I can't really comment on SS5 because I can't tell if I'm not winning because I'm doing poorly or because the broken HOM sky is distorting my view horribly.
A major, consistent problem you are having here is that you are requiring players to get 2 columns of rings on a spring, and that is very, very hit or miss and you need to stop assuming that players are always going to do that. It's not going to happen and it's actually really hard for the player to set up to make that happen. Assume the players are going to get 1.5 columns average and plan your ring requirement accordingly.