You’re probably favoring your elbow and/or shoulder if…
(1) you feel like you need to limit your range of motion
(2) you feel like you can’t “let loose” and throw with max effort
If you are favoring part of your body, then there is a good chance you’re compensating using some other part.
Also, if you’re still going through PT, then I’m wondering whether you should be pitching at this point.