Has anyone had experience open feeding powdered pollen substitute? We feed patties in late fall and the winter but put powdered pollen sub on top of the frames in the hot weather because of the hive beetles. We are in a high humidity area and I am concerned that the dry pollen sub won't fare well in that environment. Also, some years we have plenty of early natural pollen but the bees still eat the patties and build up faster. It seems like they will not forage the powdered pollen sub if there is natural pollen.