I draw and hold till I know I'm on target, then shoot. Its not any shorter of a hold then with my lighter 45, 50 lb bows.
and getting my back into it isn't an issue, I can feel it plain as day when I settle into the back muscles anchoring, and can hold that spot for many seconds. MY way of telling if I am comfortable enough to hunt with a bow is to get on my knees, hold the bow arm out to where it needs to be, then draw the bow back with the draw arm with as little movement as possible, hold it there for as long as I can imagine it would take a bull to move into the shooting lane, aim and let him have it.
You really cant shoot much weight very well by using your arm and bicep anyway. Back is where its at. When you are at the point that the back is being properly used, heavier weights come quickly and fairly easily with a little work.
It took time and work to get there with my 80#+ bows, and there were times when I didn't think I could get there. But now that I am there, they are no more difficult to shoot than the lighter bows. It all feels the same for any reasonable amount of shots. I will now shoot a hundred pound bow, which makes the 80# bow literally feel like its too light. I know that if I am to the point where I can draw the 100# with my rhomboids and traps and shoot comfortably, I am totally in the Zone at any lesser weight, as much so as anyone would be with 45 or 50.
IMO I think most guys are overbowed at any weight, 45 or not, because they just dont have proper form and back tension down pat. Not so much over-bowed as in over-their-heads, unwilling to put in the work to comfortably shoot "hunting weight" bows with proper technique. The fact is that its easier to shoot lighter bows when we have bad form, because the wrong muscles can handle lighter weights with less work and more forgiveness. Start working to heavier weights and we find out quickly the muscles and joints that are being over or improperly worked.
Its not an ethics issue. However, there is a strong argument for shooting heavier bows, one that we rarely hear the arguments for.
We are all free to shoot what we want and shouldnt besmirch a person who is different. Yet, There is merit to exploring both sides of a fence so relative as this.