I had this kind of cool solution where one chamber was 1/2P and one chamber was 6P using halt, but of course just being 2P all-around leads to much better results. 1P would be even better of course, but this waste-handling method doesn't seem to work at 1P due to the part where the two-atom pair gets snuggled between the two checkmarks.

Now with more variable waste to save instructions and cycles, and attaching the third small stick to the first checkmark to save more instructions and cycles.