I have 3 hives that were started last spring,and were wintered over in one brood box of drawn frames each.I want to set them up with double brood boxes(9 5/8) this summer.When would be the best time to do this?They would need to draw out 10 sheets of foundation.They seemed to have wintered over great and are now bringing in pollen for the last week,and I have been feeding sugar water,on and off pretty much all winter.First 2 to 1 and now 1to 1.I am going to do a brood check this weekend.Any insight would be appreciated.....JOHN