Shroomlins and Warp Beetles Spawn too frequently, warp beetles spawn so much other mobs spawn rarely at all in warped forests. Embodies seem to spawn to little, almost never.

Could you please elaborate on that? Perhaps provide a screenshot or something like that?

First, there is a config so you can adjust spawn rates. Second, Warpbeetles use a completely separate spawn classification and cap than any other non-IE mobs, so their spawns cannot be affecting other spawns in the Warped Forest.

Closing due to inactivity.

This is likely still an issue actually; if there aren't other mobs filling up the global caps (or warp beetles happen to get spawned first) you can end up with 30-60 of them in a medium sized biome.

It's a similar issue squids have in large bodies of water, their unique spawn cap means they will inevitably fill the area if nothing is in their way. It's possible that warp beetles would in fact prevent other mobs from spawning in such a scenario as I would assume (hope) they still apply to the global caps.
Adjusting the defaults would be a sensible start to resolving this properly, but there may be something flawed in their design to be able to spawn at this rate - it may even be a bug (pun possibly intended).

Reopening