This is a great example of a good player's swing and how even video can fool some people (particularly when a) it's not shot from the best angles, or at least the angles that best illustrate this kind of thing, and b) it's not slow motion at all).
Basically, in golf geek terms, you're rolling the third accumulator from 6 to 7 really hard, and that shifts not only the face left but the path left quite a bit as well. It can look like your clubhead's on an OUTward path at 6, but still be going INward at 7 due to #3.
In non-golf-geek terms… You're rotating your left forearm and wrist too much through impact. This rotation sends the path of the club to the left, even though it can look like it's slightly right-ward.
The funny thing is… the more the ball cuts, the more the tendency is for you to try to roll the face more. This is where the ball flight laws can help you, though again "path is instinctual." To make a ball curve right, you swing left more. To make a ball curve left, or lessen the right curve it already has, you swing RIGHT more.
Eventually you may want to tackle some other things in your swing (your "URC" or "upper rotational center" moves back in the backswing a bit, for example). Don't worry about this stuff now though.
Here's the plan for now:
- Get the left hand grip a little more in the fingers and probably a touch stronger. This will help you to eliminate the feeling that you "need" to roll the face a little to "close it" (a feel) so you can stop hitting cuts. So, again, a little more in the fingers, and a tad stronger, in the left hand. A good thread on this is here: How to Grip a Golf Club, Commonalities of a Functional Golf Grip.
- You're going to want to hit some balls feeling like, from the position on the downswing when the shaft is horizontal to the ground (what we call "A6" or "6" here on the site, and elsewhere), through to A8 (shaft horizontal on the follow-through) you do two things: 1) RAISE THE HANDLE quite high, and 2) FEEL NO ROLL of the left forearm.
In talking about this video with Dave (he confirmed my suspicions on the core issue here), he reminded me of a drill for which we plan to shoot a video soon:
Imagine a wall just in front of the ball (on the target side) and perpendicular to the target line. On the downswing, take the hands to the wall and then continue to push the hands UP that wall after impact. Do not take your hands left along that wall, but up the wall.
Here are some images:
Just enough of a roll here to send the path a little left. Otherwise in VERY good shape here.
Grip is a bit weak, probably a tad palmy, but otherwise good impact position. The second frame illustrates how quickly the hands are rolling over through impact though.
Again shows how quickly the club kicks "around the corner" on the downswing.
So the feel is taking the handle UP more, as indicated here:
While also not rolling the forearm over (your wrists rolling across each other):