This was a good topic for discussion that turned into cxxp like many discussions in this sub-forum before it. I believe there are no such "tricks". Extreme cutshots are hard. You have a small margin for error, and usually the shots have to be hit with some speed as well. The object ball travels slowly, making it vulnerable to rolls and nap effects.
When I learned to play I struggled very much with these shots. Then I started playing against a guy that made most thin cut shots seem like hangers. He stood high above his cue, like an old time straight pool player. I emulated him and started making more of them, especially the relatively short ones. I thought I had stumbled upon a great secret of the game, but alas, it turned into a disappointment. The reason, I suspect, that he and after a while I made these shots was standing tall, giving us a good look at the angle, but on the long shots it can compromise your aim. The solution to this is to look at the shot and aim it while standing up. You commit to this aim you have selected, which is truer than the one you get over the cue. Then you shoot the shot with the chin on or close to the cue. You aim the edge of the cue ball, not it's center which will be pointing into nothing (and thus give you no useful information in this particular case). If you have dropped straight down onto the line of aim you selected when standing up and you commit to the aim you chose, then the ball will drop. If you selected the wrong aim standing up, then experience and repetition will guide your next attempt. NOTHING is learned from adjustments made while in the shooting position.
And another thing: You can get some help from sidespin, both inside and outside on these shots, but IMHO those are crutches that should be abandoned as soon as possible. If you are to be an even moderately successful player you need to be able to hit every shot with the kind of english it requires, not cinching balls all the time. All shots should be shot like you expect to make it. NO jerking, twisting or spinning balls in that you don't have to. If the position requires extreme inside, then shoot it that way with the confidence of a young Earl Strickland, don't poke it with outside or some other crutch solution. When you poke and jerk your stroke it is your brain expecting you to miss the ball. You haven't missed the ball until it stops rolling. If you shoot even these double tough shots with a smooth and even stroke like a hanger, I expect your success rate will increase and if you stay down instead of popping up you will see what you did wrong if you do happen to miss.
