M8
DFLW was a big thing in SA for years so I know why you like it.
Maybe some server management software like PHPRat, WolfRat etc. can help you monitor logins over a period of time.
I don't know how you're managing the server but I'd guess that if players aren't in the lobby at the time you're in the server, or the map is empty at any given time might just be a reason why players aren't appearing, people may not know about it yet, if the server is up 24/7 you have a better chance of it getting known and the word spreading.