RB depth on IZ

I've been setting my RB 7 yards for inside zone. All the stuff I learned from seemed to indicate this. However I recall someone saying (Oneback, I think) that Riggens set at 5, which got me thinking (uh, oh) that maybe I need to move that back up a couple of yards and let him hit the cut quicker. I keep meaning to check the big boys for how they do it, but I keep forgetting to look for that.

Anybody have thoughts on this?