So, something similar to the system I suggested got applied here, but we're faced with the problem that the servers are most of the time empty!

I suppose the devs have statistics about the distribution of elo and players inside each ELO group. For example, for the servers I join..we have about 40-45 players in this ELO range which might be too low I guess.

This can be fixed in two ways:
1- Either fix the ELO ranges so that it encompasses an acceptable amount of players.

2- Or, there should only be 1 ELO top tier server with 3 rotating mods representing kicking,grappling, and striking. This would ensure that all top players can't specialize to get a high rank, they have to be good in all mods.

This all might become clearer with the reset. But, imo, if there's a chance to fix it before the reset, then it would be better!

Cheers!