I certainly want all the advice I can get. But, I have heard different things with starting position of ball. I have heard from some that the ball should be positioned where your swing plane will be. When you see Chris Barnes his starting position is more to the outside. I know others start where you are describing.
So, are you saying to start waist height under right chest dropping it over right knee? How do you avoid hitting your right knee? I apologize for being ignorant on this topic I just don't quite understand what you are asking me to do.
If you were to look at Barnes from behind, you wouldn't see the ball until his second step. The ball is perfectly in line with his right foot, and his head in the set up. The ball goes over the right foot, but it only feels that way, the right foot actually crosses in front of the left foot, the ball starts off in line with your target, then drops back into the swing. You swing the ball out to the right first, your target would have to be on the next lane to be swinging it like you are.
You seem to be having alignment issues and don't seem to have a feel for where your target line is or the path you should walk, or what your target should even be in the first place.
You can try my system, it is a bit advanced since it requires you to learn to throw a straight ball with very little (not more than 3 boards of hook):
To learn to throw the ball straight, stand on the 7 board with your left foot (right handed), aim at the two or three board at the arrows and try to throw the ball straight up the gutter and pick off the 10 pin. This exercise will help teach you to stay behind the ball and throw a straight ball. When you have developed a good feel for this, try doing it with your most hooking ball and see if it still goes straight, if so mission accomplished, if not your hand is still turning and keep working on it.
My spare system uses the middle arrow for all but a few spares. Start by lining up to pick the 10 pin out of the rack using a straight shot across the middle arrow, take note of where your feet are. Keep trying until you can pick the 10 pin out of a full rack of pins when ever you want. Like I said pay attention to where your feet are, as this is where all of your other spares are based on.
The pins line up with the arrows, 10 pin is on 5, 6 is on 10, 3 and 9 are on 15, the 1 and 5 are on 20, the 2 and 8 are on 25, the 4 is on 30 and the 7 is on 35.
There is a two at the pins to one at the arrows ratio, so if you move your feet one board to the right and aim at the same target, the ball will finish 2 to the left. Lets say you lined up to pick the 10 out of the rack and you were standing on 35 and going across 20 at the arrows, to hit the 9 pin you move your feet 5 boards to your right and stand on 30, the 8 pin you would stand on 25 and the 7 you would stand on 20. You will have to experiment as everyone's body is different, some move 6 boards between pins others move 7, I move 7 to start with from 37 for my 10 to 30 for my 9 then 25 for my 8 and 20 for my 7.
The 4,5,and 6 pins are half way between the 10 and 9, 9 and 8, 8 and 7.
The only thing I shoot different is washout splits (1,2,4, and 10) and buckets (2,4,5,and 8) I shoot them standing 32/33 and going straight up 25.
If you are having a problem with the left side spares it usually means your shoulders are not square to the 7 or what ever spare you are shooting. It also probably means you are walking and lining up straight with the boards instead of square to your target.