Day of Infamy maxplayers changes based on mode

[dmh]

Hoping someone else here has experience with standalone day of infamy server.
On a 16 slot server, if I run offensive, sv_playlist nwi/mp and <map> offensive, it correctly shows 16 player slots in browser/game.
I'm trying to run a co-op server though. The odd thing is the modes in the mapcycle_coop, when running sv_playlist nwi/coop:

bastogne entrenchment - 6 player max
comacchio stronghold - 6 player max
ortona patrol - 6 player max
sicily stronghold - 6 player max
(now that I look I cant find which would go to 8 players, but there is some)
etc ...

I see this across many other servers in the list too, so I was convinced it's a limitation by gamemodes enforced by the game.
But then I saw a few coop servers that have bigger player counts so there must be some way...
Event further, only some combination of game mode and maps show up in the game browser!

[dmh]

well, after some digging, I found these cvars. I dont know which is active as they seem to be duplicate, but I'd venture a guess its the doi_ one

mp_coop_lobbysize
doi_coop_lobby_size

they are both capped at 8, so I have no idea how servers are going past it, maybe plugins