ClownFish,
It is impossible to tell you what you are doing wrong without knowing what your grip and stance are like, and to know where you generally hit on the target.
Most of the problems I have seen are:
Hitting low = anticipating recoil. The muzzle drops imperceptibly just prior to firing.
Hitting left (right handed firer) = too little trigger finger and you end up pushing the gun.
Hitting right (right handed firer) = too much trigger finger and you end up pulling the gun.
Shooting slow and watching your front sight can help you diagnose right/left error. If you are hitting low, have a buddy load a mag with 3 to 5 rounds and include 1-2 dummy rounds. Then slowly fire each round focusing on the fundamentals. This is known as the ball and dummy drill and is great for diagnosing shooter error. Best of all, you see and feel it yourself, and then can correct it. Shoot about 50 rounds that way with a coach or friend and see if it doesn't help.
There are plenty of other shooter errors, but that's a start.
Regarding "Cup and Saucer," NO, NO, NO, NO!!!! Unfortunately it is still in the US Army pistol Field Manual, but the technique is crap for combat shooting. No offense to anyone, but here's why. The line of force for a pistol's recoil, goes to the rear and up with the action of the slide. None of us has the grip strength to maintain the same grip on the weapon. Essentially, the weapon rises off the "saucer" or out of the support hand. As an instructor, I have seen everyone who used that technique readjust their grip after practically every shot. That is not combat effective. A shooter may be able to shoot Slow Aimed Fire that way, but it is impossible to shoot fast and accurately. Again, no offense to anyone.
Regards,
Chuck