The grip is very important, I've had issues with mine too through the years. Back in the golden days I could always find someone that would play me for 10+ straight hours and my grip would always get grooved in long sessions. The hands are the only direct contact we have with the game, the feel, touch, consistency and power all come from the hands.....Like Earl Strickland told me one time "CJ it's all in the hands, it's ALL in the hands!!" I'd say the feet position, the hips and the hands are what separates the champions from those that practice every day and never get noticeably better......even now if I decided to play seriously I would learn something new every day and continue to fine tune by fundamentals, like Shane Van B, he told me he'd changed his stroke 4 times since 2006 and that was 6 years ago.....it's a journey, not a destination!