I'm kinda in the same boat as you, Dozer - it was mostly a budget issue for me. My first bow was 30# and I shot that for years. It got to a point where I could shoot continuously with good form, for about an hour and a half.
My next (current) bow is 48# at my draw. In the beginning, I could only shoot for about 20 to 30 minutes with that bow before everything went to heck. But practicing consistently allows me to shoot for over an hour with good form.
Basically, I didn't have the money to go from a 30# to a 35# to a 40#, etc...so I chose to go to the "ideal" hunting weight and condition myself for it. So, I was definitely overbowed at first...I think I'm okay now. I'll be shooting later today and will try the test to find out for sure.