Face could be coming off the comb left to right. Right to left for a dexter sort, the face stays with the gun like part of a fixed turret because the stock is gonna push the face with it. Left to right, it's bad if the gun leaves before the neck swivels. I've never been able to shoot skeet mounted gun and I shoot a lot of oldies with relatively tight chokes and challenging stock dimensions. I've blamed a lot of elevation problems on the stock, mismounts,etc. but seldom had the temptation to blame POI for windage or lead problems. Skeet is such repetitive practise of the same shot that timing, hold, and look pts. get grooved and then someday you add something different and everything changes. I've seen a mounted gun shooter whose first move on high 2 was to twitch the muzzle back toward the house at the pull. I didn't enjoy the squads on which this needy shooter shot four to six high house singles until someone pointed out the little extra tic. If in the unlikely event you're missing ahead, you should see a few chipped on the nose also.
jack