1.7.10 JAS has no effect on slime spawning

[irish-brigid]

Minecraft version 1.7.10
Forge version 10.13.4.1558
JAS version 0.17.8

I have made numerous attempts to prevent slimes from spawning in my underground base. Keeping all areas well-lit has no effect despite being in the MONSTER group, which shouldn't spawn unless the light level is below 7.

I tried setting various spawn tags, including "!block({'lotr:tile.mud},{0,0,0},{0,-1,0})" which doesn't generate naturally in the Overworld. They still spawned.

I tried setting "Type-Enabled": "NONE-true" which is supposed to prevent them from spawning at all. They still spawned.

I tried setting their spawn weight in all the biomes to zero and made sure "Generate Zero-Weight Spawn Entries" was set to false in GlobalProperties.cfg. They still spawned.

I tried making a new group in CreatureType.cfg:

"ANNOYING": {
"Spawn Rate": 10000,
"Spawn Cap": 0,
"Chunk Spawn Chance": 0.0,
"Spawn Medium": "air",
"Iterations Per Chunk": 0,
"Iterations Per Pack": 0,
"Spawn Tag": "!block({'lotr:tile.mud'},{0,0,0},{0,-1,0})",
"Default Biome Cap": -1,
"Biome Caps": {}
},

Under EntityHandlers\Vanilla.cfg I set the slime entry like so:

"Slime": {
  "Type-Enabled": "ANNOYING-true",
  "Contents": [
    "Slime"
  ]
},

They still spawned.

This isn't a case of leftover entities from the last time I played because I was careful to use the "/jas killall" command before closing each time.

I am getting really sick of hearing that wet slapping all the time. There is no way I'm going to be able to use all the slime balls I've collected. Covering every surface with slabs is not an option as I have quite a bit of farmland and open water.