I think ball pythons and corns vary here.
I have both, and I feed my young ball every 6 days, at 10-15% body weight right now (as mentioned above).
Young corns can be fed every 5-7 days, but I don't think either should be fed more often than every 5 days. If it is easier for you to feed on a regimented schedule weekly, then go ahead and feed them once on the same day every week. Probably better than feeding twice in the same week!
Here is a helpful guide for corns:
http://medusa-corns.webs.com/feedingchart.htm
It can be seen as somewhat of an aggresive feeding plan. I follow it pretty closely, or somewhat on the lower end. If you are feeding more than the chart though, I would cut back to at least what the chart suggests.
Best of luck
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