Fed also used to play with a 90 sq in frame which he has abandoned, and an 85 before that. For all you know, he would have abandoned his eastern grip also if he had a chance.All pros and college players? Federer plays a rather eastern forehand and arguably has the best forehand ever, with heavy spin.
What determines spin and control is not the grip but the technique. Telling me to adjust my grip was a lazy answer to make his job easier with terrible results for me.
This thread is a question for subjective experiences and yields subjective answers. I merely stated the advice which had the worst impact on my game and health. So for me, yes this was the worst advice/coaching I ever got.