I would be very surprised if many of things you’ve experienced are due to taking creatine.
In my experience, the effects are very, very mild to begin with. This is not like some sort of super drug that is going to transform you. It’s just an amino acid. It should give you a little extra boost in high intensity efforts (sprinting/weight lifting), but I would be surprised if its having such a dramatic effect on your aerobic system.
It can cause you to retain extra water, so that could explain the cramping issues if your hydration hasn’t been on point.
“virtual power to a stages crank” …I’m curious about this. Have you re-tested your FTP with the Stages PM?