I agree with the poster who said these techniques need to be adapted to each shooter, which is exactly right in my experience thus far. I have read dozens of pretty vitriolic debates on the subject over on AT where the field archery guys and the hunting guys go at each others throats and I just laugh. There is no 'one style fits all'...its just like bows.
'Form' aside I have found that actually getting your shot sequence down and having a consistent follow through on your release are critical. If you can establish your timing and keep that release clean and follow the shot completely to its conclusion you stand a good chance of being rewarded for your efforts, whether stance is standing, kneeling, sitting, open, closed, etc.