Can you explain what this does exactly? I've been using the regular Explosive Biters with Krastorio 2 Spaced Out and hadn't noticed anything obviously wrong?

Also do you have a version for Armored Biters and Arachnids?

Hi!
Krastorio 2 increases health of normal biters. (Not exactly sure about Spaced Out though)
Explosive Biters health stays the same as vanila.

So without this mod health of Explosive Biters is lower than of normal biters.
This mod increases health of Explosive Biters to K2 biter values.

Explosive, Frost and Toxic biters have the same health as vanila biters without K2 so they need this mod to keep up with K2 changes.
Armored Biters from the start have much more health than normal biters so they don't need additional changes because they are already strong enough.

Also less noticable changes are:
Spawn chances, pollution to join attack values, worms health.