Supering over last year's stored syrup
Two hives wintered in double deeps barely touched their stores in the top hive body, which is mostly capped syrup fed to the first year colonies. These carnies have been slow starters, began building about April 1st, and didn't use much of their winter stores. I realize they will go through stores faster as brood rearing accelerates, but there is a tree flow on now, and I expect them to use that before the capped syrup. How should one super to get honey with all of that syrup still in the hive? I'm guessing it will eventually crystalize before they use it all. I'm not looking to super right now, but as the top deep has only two brood frames available, they'll need room. How does one keep syrup from a previous year out of this year's honey if it's been left on as feed?
Sea level, Puget Sound, USDA 7a-7b