I don't know ... it's tough to wrack your brains over a game you almost never compete in, it seems to me. Have been practicing it some lately, as sort of a castor oil thing, maybe for a half hour or so once or twice a week before I fall back into 9 ball. Maybe some of you can do it on cruise control! But for me, every rack's a grind if I'm concentrating, and well, ugh, you can guess, if I'm getting lazy or fried.
Probably play in a tourney or a cheap set of 14.1 about once a year, so I find it hard to keep up the focus, unfortunately. I know it's good for what ails me, but I gotta admit I'd rather send the ball all over the table and let my crooked stroke out most of the time.