Well I've never done it all the time as it sounds like your doing. I would do it here n there, I think it was on 12 n 13 I believe I used it the most and actually kept track of the difference between the offensive of numbers. I can't remember the exact difference but it wasn't to far out of line than what the OP was experiencing.
I'll see if I can find the information that I had kept track of, if I'm able to find it I'll post it also.
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