[Experience]

Found a problem. Yes, tickrate cannot be switched by warmod. It just created gamemode_competitive_server.cfg in cfg folder with:
sv_mincmdrate 64
sv_minupdaterate 64
and it was executed after other configs in gamemodes.txt section:
"exec" "gamemode_competitive_server.cfg"
My server was configured to force 128 tickrate for clients independently from client's configs.
So when i've fixed values in this cfg, everything became fine!