I recieved a comment on my post and after reading this post I understand that you're trying to build more coherent communities to increase engagement. However, I would also like to point out that:

Please take note that repeated posting in OCD instead of posting in appropriate communities will result to muting of post or author.

Could be reworded to be less threatening, left out entirely, or attached to a 2nd post on a warning comment.

I think you would have a better response with an initial positive message with a link encouraging users to read this post, which does contain warnings against posting what the mods regard as off-topic content and an explanation as to the motivations behind such warnings, would likely serve the communities better.

I will post my next set of macro photos to the insect focused community.

Though it is not intended to invoke any ire, "cited" not "sited" :)
The very next tip was about proofreading...

Thank you and best of luck with the niche communities project.