I only did it because I was use to the smaller shaft and wanted it smaller, I just dont want to shave my only schon shaft down to 12 mm. RunEm, it will take a few months to get good control over it. Best thing to do is just slow down and really shoot the ball. It took me about a month to get use to all the action from the 12mm shaft.
That's one thing I do tend too do its worst part of my game I rush! Can't seem too fix it either!