Im going through exactly the same thing at the min!! When i try to hit the golf ball it ends up a fade/slice, and when i do loosen the grip and relax the arms and have a nice smooth swing it does go on a better trajectory and slightly further, still havnt mastered it, not even close in fact but a tip i was given was to hover the club behind the ball and loosen everything, its ment to relax the muscles a bit instead of having the club on the ground where you have somewhere to put pressure on it.....Im no Pro and my driving is the worst part of my game but im seeing slight improvements! Fingers crossed itl help