John, we do it on some times but can't tell if it helps or not because we don't have anything to compare it too. But if you read the link that i had in my post on nutrient stratifcation, on page 377 and 378 it might explain why NE RIDGER may have success with his program.
http://talk.newagtalk.com/forums/thread-view.asp?tid=613767&mid=5126874#M5126874
 With your high organic matter soils it might be worth a look.