When converting an HE pitcher to IR the toughest part for me is rooting out the palm up finish. Often they get the flexed elbow and have the hand on the side of the ball coming down the back side but then they get behind the ball a little early and push into the release, then flip the hand over for the Princess finish (because that is what I ask them to do). The lack of velocity is a clue, and if I am outside with good sunlight I can catch it on my phone camera. That confirms it but I don't have reliable way to treat it.My experience has been different and more often than not find less shoulder and lower back pain. They also gain speed with less effort. Control is generally more consistent due to brush trigger. Some struggle with reverting in games, but with work and commitment, they get there.