I have personally spoken to Hal. He described to me some of his systems. I have tried to make them work and cannot. I kinda got the 5-angle to work, (but I was drinking

After 40 plus years of playing I think it's because my brain is just not wired to see pool balls that way, or maybe use that side of my brain for aiming. I do way better just looking at the whole shot and pulling the trigger when it looks good. I believe that a lot of players (who knows, maybe most) are that way.
Here's something I've posted a couple of times on this:
"All I know, as someone who just 'sees the shot,' is that when I play around with these systems my shot making goes all to hell. If you were to chart it, it would look like a bowling ball falling off the kitchen table. My theory is that just doing it vs employing a system, uses different sides of your brain. So, in a sense, if you're messing with something like CTE, you really could be permanently hampering your shot making, if that side is not your optimal side when it comes to playing pool."
On another level, if something is bogus from the get-go, no amount of "trying to learn it" or "trying to figure it out" is going to make it happen. As has been said many, many, many times here on General Hospital: there are benefits that can be derived from using these systems for some people (see Dr. Dave's page on this). But not for everyone. And no amount of foot stomping from the believers is going to prove you don't need a load of "fudge" to make CTE work.
Lou Figueroa