I throw a circle change and when i pronate a bit it gives the pitch a nasty screwball affect. should i continue mastering it with the pronation or is the an injury risk?

I’ve never heard of a change of any kind being injurious…and pronation is what you want.
There isn’t any science behind folks saying the screwgie is any more dangerous than any pitch.

I’m with JD keep working on it. If you can master that movement Coaches will love it.

Agreed. What you’ve found is the correct way to throw a circle change.