Re: help with swing that's gone too far inside-outI would not suggest weakening the grip any more than having your left thumb at about 1:00 O'Clock on the handle and the V's at least between the right ear and right shoulder. The problem is likely a handsy swing, flipping the club. I am only guessing but you can check your swing with one simple test... move the ball forward, and if you can still get a divot in front of the ball with an iron then you are shifting weight well and your inside-out swing should turn more down the line. An inside-out swing that hangs back through impact will not allow you to hit shots with, say, a 7 iron played off the instep of the left foot. However, if you are shifting and turning well, and can hit a good shot with the ball well forward and still produce a forward divot, then your mechanics are pretty good. Try that test. Then when the ball is flying pretty straight, take out your driver and play it forward with a square face alignment and hit balls until you get that same feel of bottoming out well forward. I know it sounds funny to fix the driver problem first with iron shots, but that seems to work for me.
I am sort of plagued by coming from too inside myself, and if I go to the range and practice with a more forward ball position until the flight is straight, that will generally fix my swing (for a while anyway.) Be sure and finish in balance as well. Don't be discouraged by the first few shots going hard left, just keep working on it until you get it going straight.
The fact you mention pull hooking strongly suggests you are not posting forward enough and are letting the hands flip rather than getting shifted and turned. Weakening your grip will only make that kind of problem worse since you will be even more handsy.