If you're having trouble with starting up your pub give it one of the following names "CAL MAP Rotation" this will attract lots of Semi Professional players and "pubstar tryhards" increasing the competitive level.

A name like "Fun Maps" brings in the "noobs" and people who are sick of scrims etc.

Also having it permanently based on a widely played map such as Dust2 or Office over piranesi will attract more players for the first few rounds then it can switch to slightly more extravagent maps.

Set it to 2 awp limit with a vote awp choice, 16k server with a lower time limit something around 3 minutes per round rather than the standard pub time of 7minutes.
100tic on a 20 man server is simply amazing. Take a look at the #sourceinvite and CPL LA servers. they are always packed with players.