am I trippin? I can't find the options for tower rarity. Something I have going on with my worldgen puts out a tower every 3 to 5 biomes, so I was going to start with the Battle Towers config. I'm pretty stoned but I don't think I'm THAT stoned. I'm probably just checking the wrong file or something silly.
This is my config for 1.15.2
{
"requiredKeys": 10,
"requiredItem": "battletowers:boss_key",
"bossLootTable": "battletowers:boss_loot",
"blacksmithLootTable": "battletowers:blacksmith_loot",
"entranceLootTable": "battletowers:base_loot",
"jungleLootTable": "battletowers:jungle_loot",
"layerLootTable": "battletowers:layer_loot",
"libraryLootTable": "battletowers:library_loot",
"mineLootTable": "battletowers:mine_loot",
"bossHP": 150,
"bossDamageScale": 5,
"floorAmount": 10,
"floorRandomAddition": 5
}

While the issue with the rarity config option remains, the actual problem with structure spam was a mod called StructureZ. I'll report that part to them :)
-Edit- I was incorrect, even without StructureZ I still get a battle tower every 1 to 3 biomes. I'll keep taking out mods and generating worlds and see if I can pinpoint the issue

This was taken with a fresh minecraft and fabric install with only battletowers-2.0.1_1.15.2 and fabric-api-0.10.8+build.310-1.15

-Edit-
Upon deleting and reinstalling everything again and only loading the StructureZ mod I have the same issue. Nothing but Fabric installed with Fabric API and the structurez mod.
So.. Fabric problem?

iirc I never implemented a tower spawn chance config option on the 1.15 branch. It shouldn't be that common, but I can fix it in the upcoming rewrite.

If you want, I can upload a fix jar with a larger spacing number. I'm not sure if it would fix the issue (honestly, I have no idea how spacing fully works), but it would be worth a shot.

I have no idea either lol I haven't played Minecraft since beta, but my Dad and brothers wanted to play together on a server so I'm putting a modpack together for them.
I really need to start a vanilla world and see how structures spawn just to determine if it's a stock issue or not. There's a bunch of abandoned boats and ruins being generated, and on some seeds the boats are wrecking into the ruins and they spawn in pairs - so something definitely isn't right.

That'd be great to have the option to try it again and see how it works vs the old values, but you don't need to go out of your way for just me. I'm surprised there wasn't already a report about it tbh, since it's so easy to reproduce and so quick to notice