I have to disagree that the cheater's pool even exists. I can't even stay in the same lobby having three systems/games/users in my house. We always get sent to different sessions after missions and it's rare we spend more than 30 minutes without having to reinvite everyone to the same session again. This goes for all of their session types. Free aim is dead but it was the same with Red Dead and GTA IV also. You've got to be good to play in that type of environment and the average GTA O player needs auto aim (my wife). This is why you are seeing empty sessions. That and the Bad Sport system.
As to why you can't join a decent job or playlist, it's simply because they are now grinding sessions so you're only going to see the same races and jobs repeatedly. Blame Rockstar either way, for the asshat lobbies and overall design of San Andreas free mode.