How to Avoid Overhitting When you get a Real Sitter
by: Dave Winship @ On The Line

Shorten it! Shorten your racket and shorten your backswing! They haven't invented a racket with a button that shortens the grip for these sort of shots, but you can achieve the same effect by shifting your hand up the grip a couple of inches. This should give you the feeling that you've got more control over the swing. Shorten your backswing too - just a shoulder turn will do. But still go for a full follow-through, because the last thing you want to do is trade your overhitting for a "nothing" shot!