I have used most of the above techniques in the past. I now use what I call the "push and hold" method.
It is simply concentrating on pushing the bow hand at the target, and focusing on execution of the shot trying not to cause movement to the bow hand at the shot. Easier said than done, but the following really helped me. I am so confident in it, I almost want to keep it to myself. I use a dime, or nickel on the top of my bow hand during the draw and shot, if it stays on, in most cases I have pushed, and held the bow without dropping it. Even when it falls, I have managed to keep the bow solid enough to get the job done.
This has kept my bow hand up throughout the shot, and increase my accuracy more than any thing I have done so far. I have found, at least for me, that most of my misses will come when I fail to do two things, one is push the bow hand(gently)toward the target, and failure to hold the bow in a solid position. If I don't push, I will drop.
It seems that there can be differences in style from one good archer to the next, but one thing is consistent with all of the good to great ones. They all have a solid bow hand at the shot.