I'm in the same boat with a 910D2 and same shaft. Hopefully when I change it from A-1 to B-1 (maybe C-4) it will help.  First round I played it was very deep and straight, now after the third round it's deep, but in the woods on the left side.

6.5s are pretty stiff.  Maybe you could swing an x shaft.  I love the kal'li for the low spin boring trajectory.  Before I changed shafts I'd adjust the head and see if that fixed the hook. --Jerry

Maybe.  Try switching the setting to C-1 or B-1 and see what happens.  It may be too light in my opinion if you are swinging 6.5 project X shafts.

RC

Yea Im going to play around with the settings a little bit. I went with the lighter shaft because thats what Im used to. The wierd part for me is that on the A-1 setting the face is already open and when I typically would lose a drive 9 times our of 10 it would be off to the right. So now when I see a lot of pulls left it brings up a red flag for me. Don't get me wrong I love the driver its stupid long, Im just want to make sure it the right shafts.

Whats a typical cost to swap out a shaft if I wanted to go with an extra stiff. I would guess its a bit different than a standard driver because of the adjustable tip. Thanks.