From recent, very disappointing experience -
I think with nucs, the ones I feed 1:1 syrup build up faster in summer, than the ones I give a bar of partially-capped honey. As if they don't want to increase brood using the honey. So then the colony doesn't expand even enough to cover that extra frame.
Also keep total pollen low. Just enough. And if I re-queen in late spring/early summer, the stores bars are at peak. So I need to remove some, and put in undrawn comb (I use empty frames) in order to keep a safe balance. Of course most minimum number of hive bodies.