One thing that help me alot when I play out of rough is to not rest my club on the ground. If I pressed the club down behind my ball im usually pushing more grass toward the ball which will result in bad contact. Also, open your clubface slightly (so the grass doesn't grab on the the hosel and flip the clubhead closed) and come steeper into the ball (by hitting steeper on the ball, you have to go through less grass and you will make much better contact). Good Luck