That is the whole game right there, consistency on your draw and anchor is the best way to maintain accuracy. You may be shooting too many arrows per round, reduce it till you no longer feel like the draw is bouncing back and forth. If you start losing back tension you will introduce creep into the shot. Shooting a compound, you benefit from the back wall you hit when you draw the bow, no such thing exists shooting a recurve or longbow. You need to learn to feel and use the back muscles to signal "full draw". But you never really stop pulling.