By your description it sounds as though you are "stupifying" the bees with too much bee-go. When too much bee-go is applied the bees become somewhat drugged and do not know which way to go. Bee-go applied under a sunny day may vaporize too fast and do the same thing. When we rob our hives.. first smoke the bees down good, then apply fume board caddy cornered leaving small air vents,we squirt beego in a three circles spiraling toward the center. That is usually enough to do the trick on sunny days. Leave open for five minutes or so then close all the way. you can also apply a little extra smoke while caddy cornered to help them down. We rob 3500 hives this way and don't have any problems most of the time (as long as the fume boards don't become saturated. Once a week we try to air them out. Robert Williamson texasdrone.com