Part of my reason for this is..
I was thinking about making a basic tutorial for lesser-skilled players to help in kicking. After a few years of taking time-outs in APA and some of my own playing, I've found a fairly simple way of estimating my kicks to at least obtain a good hit(and a possible make). Valley barboxes are the majority of tables that are used in APA around here - Diamonds are starting to pick up in number, though. I don't use a system, but play my kicks more like my banks - by feel of the table.
For Valley tables, I try to find the equal-in/out angle first. Once that's done, I point out a spot about 1/3 the distance from that point to the point on the rail where the ball lays. Using a hard/firm hit and center ball almost always guarantees a hit and sometimes pocketing. For league rule games, this has helped many plays avoid giving up ball-in-hand on basic one-rail kicks. Since speed can play such a big part, the harder hit limits the variance and emphasizing center ball gets the player away from hitting any which way that may cause the angle to get thrown off unexpectedly. It's pretty basic and works very well, imho. Diamond tables tend to kick back sharper so a harder hit isn't really needed, while the 9' tables I play on tend to play much closer to the actual in/out angle.
Here's one of my awesome MS Paint drawings to show a (very) rough example.
View attachment kickexample.bmp
I wanted to know what kind of systems people used and how many beginners could use help in kicking. From the sounds of it, most that replied know kicking pretty well and have some kind of system, but I still wouldn't mind helping out some of the APA players a little bit if I could.