FYI, I am not interested in debating this further. The years-long debate is well past the “beaten dead horse” stage. All of my perspectives and opinions can be found on the eye pattern “best practices” resource page, for those who are interested.
I would instead encourage them to try to improve their stroke mechanics and draw shot technique. I certainly wouldn’t want them to lose the benefits that OB-last focus provides. 🤓
Try to wax the CB to see if that makes a difference. As I mentioned, the cloth in my cushions is very new, so that could have something to do with it (but I doubt it). Also, if you post a video of the shot (maybe with unwaxed and waxed CBs), that might shed some light on things.
I most certainly use both the 30° rule peace sign and the 90° tangent line, or something in between based on shot speed and distance between the hits (called “tweeter” shots), to plan and aim carom and kiss shots. For complete details, see the videos and info here:
carom and kiss shot aiming
I have lots of videos and other resource dealing with this topic. CB control is probably the one thing I have dedicated most of my energies toward over the years. Everything I've done is available here:
CB control resource page
And here's a good place to start for most people:
CB control...
Polishing the CB will make kicks/banks go longer. See:
ball cleaning and surface treatment effects
It is natural for kicks/banks to progressively go longer as the angle widens. See:
kick and bank shot effects
Have you carefully tested your table using standard systems to compare the...
It is covered in detail in the section starting at the 5:11 point.
It is just maximum topspin with medium-fast speed.
I think my CB and cloth conditions are typical (except the cloth on the cushions is fairly new).
FYI, I just posted a new video that demonstrates how to predict and control cue ball direction off a rail with natural-angle follow shots, and how to change these directions with speed and sidespin. Included later in the video is some head-cam POV footage to help with visualization. Check it...