9#%002M

In Skirmish M-U, 7 zones, so to fit a template on S, you need to make 3-4 zones per level. Well, 3 is somehow too few.

S-size is 36x36, M-size is 72x72, meaning S+U is 2 times smaller in area than M-U.

Therefore, on S-size, to get zones different from "castle + 2 mines", you need to make 2 of them per level, 4 zones total on the map.

Well, a Dragon Fly Hive is exactly 9k, so it should generate.

In the M-N range, the exact upper boundary (N) does not generate. Example - treasure zones on 8mm6a, there the upper range is 15K-20K, and relics do not generate, and they have exactly 20K value.