Thanks for asking! I think this is a big issue and that a lot of archers short shuck their draw. I'd start with some mirror drills. First air draw, like air guitar, no bow. Simulate your normal draw, now add two inches, now another and another, now two more! You will find that it is physically possible to draw your string hand several inches behind your ear. The great archers of Mongolia, China, Korea and Japan did so in days gone by.
Look at your local compound archers. I hate to admit that most of them have better form than most stickbow archers. They get their hands to the vicinity of their ears. More to the point they get their forearm bones and their elbows in line with their arrows, more or less. Do a web search and look at the form of some Olympic recure shooters. They generally draw to between the corner of the mouth and the ear. And they get their forearms and elbows in line, more or less.
This longer sort of draw produces a lot more arrow speed and is more consistent, especially left/right. I believe you could add two, maybe three inches to your draw length, if your bow is not too heavy. You will need to stand erect, not leaned forward, and keep your head back a bit.
Search for the best anchor point in the feel of your back and your shoulders. Forget accuracy for a while. When you have found the best feel in back and shoulders, begin to search for references between you hand and face, bone on bone. Maybe back knuckles on cheekbone. This is variable as faces vary so much.
Kindly let us know how it goes.