Alot of good advice thus far...here is my input.

[ul][*]Make sure the riser is to the thumb side of your lifeline....relax your bow hand (if your fingers are sticking straight out your hand is NOT relaxed)...and make as little contact with the riser as possible. Alot of factory grips are not conducive to this...whenever I buy a bow, the first thing I do is pop the grip off. Simply put, you don't want 'too much hand' in the bow. I shoot off the riser, give it a try, you might be surprised how much it helps.[/ul]
[ul][*]Find a SOLID, repeatable anchor. I see alot of folks shoot that think they have a good anchor, but in reality it is a floating anchor (I was one of these for a VERY long time!)...I shoot both a back tension (for 3D) and a caliper for hunting, I turn the backside of my hand against my face with the space between my index and middle knuckle (lowest knuckle) going right to my jawbone. Using the same anchor for both releases forces me to use my middle finger as the trigger finger on my caliper....but this has helped tremendously as well.[/ul]
[ul][*]When shooting a caliper, 'hook' your finger over the trigger (into the first groove or wrinkle) and load a bit of pressure onto the trigger before shooting. DONT set the thing up to be so hot that it is a hair-trigger...you will have target panic really quick! [/ul]
[ul][*]Keep the elbow on your release arm up.[/ul]
[ul][*]I would suggest a sight with a round pin-housing. Center the pin housing within your peep. I think alot of folks center the pin in the peep....but center the housing![/ul]
[ul][*]Concentrate on the target...not the pin.[/ul]
[ul][*]Work on shooting with both eyes open...I know you say you just can't, but it will help you tremendously. Just work at it until you can do it.[/ul]
[ul][*]Shoot blind bale during the off-season...take the sight off your bow and shoot at a bale with no target. Concentrate on your form instead of where the arrow is going. It is very difficult to work on form AND hitting an exact spot. Turn it into two processes in the off season and you will shoot better.[/ul][ul][*]Have someone that knows archery check your draw length and adjust properly. A great number of shooters are shooting a bow that has a draw length that is too long. When I was first starting out (I am a self-taught shooter learning through trial and MANY errors) my 'anchor' was on the back of my neck....I was shooting a bow probably 3" or more too long.[/ul]Just a note about tuning; Tuning is VERY important when hunting as you want true arrow flight as a wobbly arrow can wreak havoc on your broadheads ability to do it's job. However, tuning will not make you a better shooter. A good shooter can take a bow that is way out of tune, and hit the same hole...because their shot sequence is repeatable.

Hopefully these will help you a bit, I'm sure I will think of more....good luck!