⭐ Merited by PowerGlove (1)
It would be better to, let’s say, subject signature bearing on the whole to earning at least x Merits in the last y days, leaving the ranks be, although there are still plenty of drawbacks, especially for those that are not active or roam boards that are not often merited.
Yep, that is a much better approach and basically what I suggested a few posts up. 
Other modification of this suggestion already mentioned some times. Few similar discussion in past,
Reducing (removing) airdropped merits for those who didn't earn 1 single merit
[Proposal] Tackling the spam
Except, instead of X merit in Y days, I would make it X merit in Y posts. That way, you're not penalized for low activity and you can't spam the forum hoping that some small fraction of your posts will get merit.
It's interesting idea, although member who only post at board with low merit circulation at disadvantage.