So I've started making a few splits and have these really weak nucs in my backyard near the hives I split them from. I started my splits on 3/28-4/4. Our nectar flow is just beginning with pears, maple, deadnettle, henbit. When I returned from work today there was a load of activity at my nucs and it wasn't good. The entrances were reduced using the typical reducer which comes with the 5 frame nucs, but that really did not appear to be enough. I shoved grass and sticks in the entrances to reduce it to the smallest opening possible and still allow 1 bee to pass. I am not feeding. Each Nuc has at least a frame or two of nectar/honey/pollen. They are getting decimated! I did two different kinds of splits. Some I pulled the queen/brood/food and others I pulled eggs/brood/food. They all got at least 2 extra frame shakes of bees that were on the brood frames. The populations are really decreasing due to the fighting. I expected to lose some foragers heading back to the main hive, but I believe this robbing has caused a major population drop. What else can I do to save these nucs? Add capped brood from other hives to increase the population more quickly? Any advice would be appreciated. Thanks! BTW- we have plenty of flying drones and loads of capped drones here.