Custom ocean biome spawning too far inland

I'm not sure why but, my custom ocean biome constantly spawns too far inland no matter how I change its values. I know it's spawning inland because it's a biome for a dimension that is covered in snow, except, intentionally, the ocean itself and thus, I can easily spot it when it spawns inland. This isn't to say that it'll spawn right smack dab in the middle of a biome, it only spawns around the edges, like it's supposed to but, too far in. I don't have anything weird going on with my ocean, it's simply supposed to mimic the overworld ocean.

I am using 2024.4 for Minecraft 1.20.1 Forge.