I may have missed this earlier, but why the feedings every 5 days for PB? At the size described that seems awfully frequent. I do every 7 days initially and am comfortable pushing it out to 10 once they are sub-adults.
When we got the two of them they had been eating every other week and I felt they were a bit small for there ages so my plan was 3 quick meals then on to weekly, the 3 5-day meals ended on a sunday which was the day I wanted feeding day to be.