Bow weight can influence how long you are at anchor position. Even those fellas that hold a long, long time, that are good shots their relaese is dynamic. There is a transition into the back muscles, for some this pause may be 2 seconds, others just a moment. IMHO the lower the bow weight the longer the transition to the back muscles. If you are shooting 70 pounds vs. 30 there is a timing to the transtion and refusual to hold the string. 70 simply takes it faster. You have to shoot poundage that you have a sense of control, but you are also not shooting tons of arrows like in target archery.
I remember when I was a kid people talked about bows being heavy when shooting at game animals, not being able to pull back due to the intensity of the situation. I have had the opposite. My perception is the bow is lighter when adrenaline hits me! I have had difficulty refusing to hold whne drawn down on a game animal.
Many bowhunters shot heavier weight, not just for the penetration and added benefit of shooting heavier arrows, but in the adrenaline-soaked enviroment of a killing bow shot at a game animal, they need the shot to happen without thought of technique or outside distraction.
Allowing the shot to happen, instead of making it happen. You have to learn the mechanics, then it is all about aiming at as small a spot that you can bore a hole through. The better you learn the mechanics, the better you aim and vice versa.
I would learn what it feels like to shoot with proper back tension as my focus and let the holding time be what is going to be.
Enjoy this sport of Kings,
Jeff Schulz