Thanks guys. This is just the kind of info I was fishing for.
I really noticed a difference in where shots were going with hard dual cams with a lot of letoff.
I always thought it was just me, since so few other folks have said anything about it.... But that comment above has me wondering if I'm so singular after all. I have a very hard time maintaining good back tension and have a really bad tendency to creep with high let-off (75%+) bows. Thus my belated interest in learning about creep tuning.