The bees in my Top-Bar hive have stopped building comb backwards after their original manifest destiny push. About half the box is entirely empty and they're just focusing on the front (which is kinda getting overcrowded now, bees often are seen overflowing out the front entrance. There are spacers on the last half of the hive to encourage them to build honeycomb in the back. Can I shift some frames around to encourage more hive building? Are there some techniques? I've already rubbed beeswax on the frames.