I don't see any negatives to feeding 5 or 7 days.
My boyfriend feeds his ball every 4-5 days. I feed my snakes once a week. I have 3 girls the same age as his ball and his is twice as large. (they're all around 6 months old)

sidenote: I highly recommend Robert Seib. He's local to me and a retired Herpetologist from UC Berkeley. An extremely credible and knowledgeable guy with gorgeous snakes.