Given that the rows are about 3 tomes further apart than at the witdean, 6 inches would be very shallow, but you're probably talking rubbish.
I asked a direct question - how steep is the banking between rows and was told by Hebberd that it would be the same as in the South Stand but better than the North Stand. In the SS the rows are (I think) about 6 inches above/below the next one. OK, so it could be 8 inches but I haven't taken a ruler to measure.