Could it be your hip is crowding your stroke, causing you to subconsciously steer around it with your grip hand?I did shoot a video and I believe the problem is poor stroking with the short bridge length required on these shots.
My stroke is generally pretty straight with a normal bridge length and follow through. But was horrendous on this excercise.
It's funny how something random like this can expose major fundamental issues a person isn't even aware of.
Here is the video. It's so ugly it's hard to watch. Hard to believe I'm a 600 fargo. $10 nine ball anyone?:embarrassed2:
https://youtu.be/hV61CwL2Pfw
pj <- been there done that
chgo