Need to know what the problem may be. I graft 24 larvae into JZBZ cell cups and put them in a starter colony. All appears fine out of the starter with approximately 80% take. After 24 hours I put them in a queen right finisher. Two mediums with a queen excluder between them. The queen IS in the lower unit. A look at the cells at about 4 days after grafting show about 50 to 70 % take. I didn't look again for about 8 days. Only 6 to 8 cells remain. At day 13 only 3 cells remain. What Gives? Hive is extremely strong and I rotate the uncapped brood up about every 8 to 12 days. Cells that do make are beautiful. Would like to have a few more make it to finish. Any tips out there? This is the third time about the same thing has happened.