Mine is an old Wing Archery Impact that is supposed to be 65# but has dropped a few pounds over the years to about 62-63 with a 33% letoff. Although my bow is huge it really seems lighter than many of the new bows on the market. I use a release, and I got a fancy new rest this year. I think I will get a new sight next year, then maybe buy a new bow another year after that, and move all my parts over to it.
I have found that I either need to shoot in the first 8 seconds, or wait a little while until my arm quits shaking (too tired?) around the 15 second mark(with great concentration) but then it is a short window again before letting down. Like many others say, I play around out further at 35-40 yds, but I really have no plans to shoot anything out there. I can keep things pretty good at 25yds though.