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Use the PlayerCountOverrides and force it always to be on low by having something like 20 and 21 players as a requirement for medium and large.
Also 3x the same map pool for the server does the same thing.
Small teaser of how the demo upload will work; only PlutoT6 is supported atm.
Thats because a manually installed version takes preference over the plug-in store version.
You memed up the configuration of the server or iw4ma.
How does your server config look like?