Why barreling-group-2 was marked as incompatible?
Pelagos used to depend on both but now you're incompatible (although Pelagos wasn't updated for 2.1 yet but I'm just curious)

You have it written in short description

Mod introduces a tiered barrel and barreling machines system and barreling group to the game

My implementation of barreling group is build into mod itself

After reading whole description I realized thats probably only place where it is said thats barreling group is baked in
I ll add it somewhere in long description