Do you mean to say that you can stretch from middle c to the g above the octave above middle c? If so, that is one hell of a reach. I'd say that anyone who can reach that far has a hand "deviation."
I'd suggest having a teacher or another experienced pianist watch you play and give you some tips on hand and finger position.
Casenote,I noticed that when you refer to the lateral turning at the wrist, you say "jerked to the side". Since it is normally not necessary to "jerk" the hand to the side simply to align, say, the 5th finger or thumb with the arm (it should be an easy, smooth motion) I think perhaps you have some problem with the lateral range of motion at the wrist.I suggest two things: (1) compare the range and ease of lateral wrist movement of the right hand versus the supposedly normal left hand. Also, compare the range of rotation.(2) If there is indeed a difference you need, to see an orthopedist and find out what is causing it. Good luck.
First of all the CDEFG position is the MOST uncomfortable position you can posibly find at the piano. The natural hand posture for the piano in the Right hand is 12345 on EGbAbBbB and Left hand 54321 on FGbAbBbC. This is what Chopin considered the natural hand posture for the piano. This to me would be the best starting point to determine the damange in your hand if there is any. Unfortunately its hard to give advice in this situation without sitting next to you at the piano.
I think the damage to my hand is pretty minimal, based upon this position. It definitely is comfortable. This brings up another question. I've been working on the parallel set exercises in the Chang book, and I believe he says to do them on CDEFG. Also, this seems to be the best position for strengthening the lumbricales. Even though I believe Chang also says in the book that there is no evidence that the lumbricales are important in piano playing, it seems that one of the sources of improvement in exercise #1 (where you practice playing one note), is through developing the lumbricales. And it seems like the CDEFG position is the best for this, because this position seems to be the best for isolating the movement that uses those muscles. But maybe other positions are just as good. I don't really know, but I am interested to know what others think. I could use some more information on ways to exercise the lumbricales. Also, while I know it is recommended to only do exercises in the context of pieces, it seems that I need to develop the technique to play a single note with a correct motion as a prerequisite to developing any other correct technique. Sure, I can learn all sorts of easy pieces, but I won't be ingraining any "correct" motions. Am I on the right track with this? Is there anything else I can do in the meantime? And how long should this take?
do you think so much when eating with a knife and fork?
1. Is there anything I can do to test whether I actually have a hand deviation problem?
By the way, I'm currently working on my own without a teacher. I definitely want one, but I'm having a hard time finding someone who understands all this stuff. I met with a teacher in my area a few weeks ago who teaches at a nearby University and is quite accomplished.
How bad is it to play with a raised wrist? By raised wrist, I mean that instead of being aligned flat with the forearm, the hand droops downward (so that the first set of knuckles are below the wrist.
I cannot understand why CDEFG could ever teach you anything. One hand position will not teach you much, and trying to develop technique to play A SINGLE NOTE with correct motion is looking at the leaves and forgetting about the forest. Try not to get overly obsessed about what the hand is doing, afterall do you think so much when eating with a knife and fork? The way muscular memory works with piano is very much the same.