When I used to play snooker I had an alternative method of keeping my stroke in tune that worked very well. I used this for years and whenever I felt myself missing any shot that was easily pottable I would return to my practice and improve my game.
Start by placing a striped ball on the headstring, one marker in from the side. (Sorry, my laptop doesn't like the WEI table) Shoot straight across the table, so the OB follows the headstring. The OB should return straight back and hit the tip of your cue dead in the center. If it veers off the headstring before contacting the far rail you're aim is off. If the ball veers off the headstring after contacting the rail then you're applying side to your shot when it should be a center-ball hit.
To make this harder, I would also shoot the length of the table (~18-22' depending on how far up you started) to make even the smallest of errors apparent. Once I could consistently hit the length of the table and return the ball to my tip I knew my stroke was fluid and straight. After practicing this for a little while (20-30 mins) I was always able to shoot better.
Start by placing a striped ball on the headstring, one marker in from the side. (Sorry, my laptop doesn't like the WEI table) Shoot straight across the table, so the OB follows the headstring. The OB should return straight back and hit the tip of your cue dead in the center. If it veers off the headstring before contacting the far rail you're aim is off. If the ball veers off the headstring after contacting the rail then you're applying side to your shot when it should be a center-ball hit.
To make this harder, I would also shoot the length of the table (~18-22' depending on how far up you started) to make even the smallest of errors apparent. Once I could consistently hit the length of the table and return the ball to my tip I knew my stroke was fluid and straight. After practicing this for a little while (20-30 mins) I was always able to shoot better.