7:3:1 ratio for me. I like getting it down fast, keeping it slamming on the bottom making a racket and kicking up mud. They KILL it at the main lake I fish at 90% of the time. I throw 6, 8 and 10XD all summer long. I have never used a lower ratio, just doesn't seem to make sense to me, but to each their own. If I don't want it as deep as it can go, I slow down the retrieve.
I love throwing deep cranks. Its awesome when the rod loads up.