That would be me.
OP, there is no reason to feed the snake every 4 days unless you just absolutely want to try it. I would let it settle in for a week. If you want to try feeding a F/T at that time, go ahead. If your snake refuses it wait a few more days then offer it a live. Personally, I would continue to feed whatever prey it is used to, for at least a month, so that you get it established at feeding for you. Once you have it feeding on a regular schedule, then think about switching it to F/T...