I remember reading an interview with Fred Bear in which he stated he drew a 65# bow because if he shot a bow of lighter weight, his release wasn't very good. I have a similar problem, but guessing mostly due to poor form and release. When I shoot lighter weight bows in the 40 to 45# weight, I have a terrible time getting a consistently clean release. I come to anchor point easier, but find I tend to pluck the bow string. When I shoot 55 to 60# draw weight bows, my release seems to be much cleaner. I am not strong enough to really pluck the bow string with the heavier bows.
I personally feel that if I could master the release with lower poundage bows, my accuracy would increase with heavier bows as well. I feel as though using heavier bows to achieve a clean release is not addressing fundamental issues with my form and release.
In the end, it is what works for you. If you can hit what you aim at, that is all that matters; form and release be damned!