Habu, now you are amazing me with your arrogance.
Example:
I was probably a quicker learner than you were.
Do you realize that every flight school, and every Instructor tells each student "you learn quicker", or "you're one of the most natural pilots I have trained"? Its an almost required thing to keep the students confidence up, and keep him coming back for more. They need to do this since most people who start flying lessons don't finish. Maybe you actually believed that line?
A slip is of course a maneuver one should learn, but it shouldn't need to be part of your everyday manuevers.
I am sorry you cannot learn alone. If you really needed 20 hours before you could solo, that would confirm your inability to learn. I can learn with every flight, regardless of an instructor sitting with me or not, and I think most pilots would agree. I can and work at learning my climbing ability at differant speeds, the power settings need for required climb and descent rates, I can learn to make better landings with each settings of flaps, or no flaps at all. I can practice flying a pattern without touching the throttle.
I can practice intercepts, holding patterns, single engine work, I can learn to naviagate or just fly with a selected instrument blocked.
Flying for 23 years now, and I am still learning, with or without an Instructor. Too bad you feel you are incapable of learning without being spoon fed.
Dago