It just hit me: could it be that the reason I'm not seeing much activity outside my walkaway split (a brood medium merely removed from its motherhive a week ago) -- despite there being lots of bees inside -- is that mostly nurse bees are within, and I didn't get many foragers when I made the split? I didn't "dump" any extra bees into the brood medium when I separated it from the motherhive (to account for drift-back). A big mistake?
Also: I probably should feed the new split, but need to keep the entrance reduced as much as possible; a Boardman feeder, then, won't apply, and I don't have any kind of medium-based feeder. Ideas? Or should I call off the experiment before SHB's overwhelm the walkaway and just return it to the motherhive?