I've worked on my stance, my alignment, my dominant eye/vision center. Yet I still have the same issue of inadvertently putting right hand spin on the ball when I think I'm hitting center.
Well after some recent video review I found the cause of the problem. I was aiming at center ball correctly, but my elbow was angled to the left. This was causing the tip to move to the right during the forward swing.
By straightening out the elbow, it immediately fixed the issue.
Which now leads me to my question. Is there something I can change in my stance so that my elbow isn't at an angle, or do I just need to keep making a conscious effort until it becomes automatic?
I'm sure Pidge means well, but he's not helping you determine your problem.
First you need to do some troubleshooting to eliminate possible variables:
If you properly lined up for your shot with a straight back arm, and then you angled it under your torso when you got down, you should find that you are missing most of your shots. If that is the case, then your feet are properly planted and the problem is with your arm.
If you're not missing most of your shots, but pocketing most of them with right side spin, your stance is probably still partially accommodating the bent arm.
Another issue to consider is how much you are angling your arm. A little? A lot?
That's why this is so complicated. I work with a lot of players with this issue. The fix takes time with a lot of little tweaks along the way.
Always double-check your stance. Players with your issue tend set up their back foot to the right of the line of the shot (for right-handed players), and it creeps back to that position as time goes by after the correction is made.
Set up a shot, plant your feet and get down over the shot. Then stand back up (but don't move your feet) and place a piece of chalk behind the heel of your back foot. Then step away and look at the chalk relative to the line of the shot. I have found this simple method to be effective in checking your back foot placement. Cameras are not always the best method to check this. You can take your cue stick and hold it over the line from the chalk to the cue ball. Take a look at the line and compare it to the line of the shot. Do the stance check with several different shots and angles.
Once you eliminate the stance variable, then you can move on to your arm.
Make sure the knuckles of your grip hand are situated along the side of your cue, and not under it. Keep them in the same position throughout your strokes. Check them at address and after your follow-through.
This should help get you started in correcting the issue.