I'm kind of doubtful about your own diagnosis that it's the stroke. The stroke is the last thing that happens in all shots. I've seen guys with stroke idiosyncrasies, but it was because they had a tremor in their hand from some type of neuropathy problem. Not much can be done there. Nick Varner got it later in his life. Some even get the "yips" in mid stroke similar to golfers when they're putting, including top pros.
Without the above, (my opinion) is stroke problems have to do with the angle of the stance, body, head and eyes in relationship to the shot line. Also to be included would be the fingers and hand gripping the cue. Some grip it tight like they're chocking a chicken...some lightly in their fingers...some releasing the last couple of fingers in the back stroke and retightening
them on the forward stroke. It can also be the wrist position. There are concave wrist positions (Keith McCready)...convex wrist positions...and straight wrist positions. Some remain that way throughout and others are curled during the stroke which also changes the angle of the cue coming into the CB. A lot of time we're doing things we aren't even aware of doing because it got ingrained and "feels" natural and correct. That's where a knowledgeable set of eyes and highly experienced instructor/player can fix thing in a flash. Pool players just hate to spend the money on lessons. A new cue...a new carbon fiber shaft...a new whatever else...no problem! Lessons? OH MY GOD! $$$$!