Good reply LAMas..., but if aming systems break down.., and without one you likely wont improve, what system do you use and what do you do when it breaks down?
Enough playing time is necessary using the method to understand its limits. I find that I hit certain shots better with one system over another. These are usually shots where throw is a factor.
After playing for years, knowing how to deal with throw and applying it to aiming systems is an experience based tool. Paying attention to the effects of friction on the balls will come naturally.
The systems that are affected least by throw are the pivot alignment systems due to their many built in adjustments. They have sighting adaptations that can be learned, but bringing prior knowledge to the table through experience based practice will influence your progress positively.
Best,
Mike