There is one system that works for everyshot.....ghost ball.
Just because you can not get the CB to the spot on the table to make the OB go where you want doesn't mean the sysyem is flawed but your lack of skill using that system is flawed.
Noitce I said spot on the table.....not hit the OB contact point.
Training with the arrow will help you get a mental picture of the OB and CB before the time of contact, at time of contact and where the CB goes after contact with the OB. Doing this over time builds a mental data base of what shots look like before, at time of contact and after. Training with the arrow gives one a constant spot on the same shot over and over until the mental picture is set.
As example, recently, I have started making pretty thin cut shots. It all started when I saw the first one made and that imagine of the successful pocketing just lead to more.
Also, over time and if you are truly paying attention, you will start to see the relationship between the OB contact point, the spot on the table where the CB needs to be to make the OB go where you want and the location of the CB contact point.
Even with the arrow removed, there is still this data base of mental imagines to use so your are not guessing, you start "seeing" where to put the CB on the table to make the OB go where you want or the CB go where you want after contact with the OB.
Ghost ball is the hardest to learn to use effectively, but training with and without the arrow helps ease the process.
Even with GB, the pocket really doesn't matter except for shot speed and cheating the pocket concerns. The thing that matters is the angle between the OB and the CB. This angle determines where the contact point is located on the CB. More the angle, the farther the CB contact point is located off center of the CB's center line.
Knowing this relationship helps the gauge if the top of the CB, which is on the same plane as the center and bottom, is aimed to the point on the table to put the CB to make the OB. As mentioned eariler, the arrow helps with learning this relationship.