I can confidently say that 30km is nothing for one ride. It's just normal. I leave the house, move to one spot, ride there until get bored, then move to another one. And here we have a ~30km line around the city. Plus I do something on the run, like stairs drops, BHs on/over obstacles, manuals, stoppies, 360s, anything you can do on the run.
Don't know why you and few others have BATHTUB because of that. I ride this way and I'm happy.
22-12 for moving between spots and pure street(considering that it's 1.83 and 24 street-trials wheels almost like 26 XC you can get some really nice speed). On spots I set 22-17 and do more trialsy stuff.