I did the math and for feeders, 1 uncommon is worth 2.6 commons. And food is plentiful, so I don’t care how much food the camps use. TC19 and TC11 give commons only at 2 recruits pet feeder output. TC2 gives commons and uncommons at 5 recruits per feeder output. I don’t know what the ratio of uncommons to commons is, but it would have to be very high – around 93% IIRC – to make TC2 as good a deal as TC19 or TC11, given the much higher recruit cost for TC2. I don’t think it actually is near that high.
What this means is that there’s no reason to run anything but TC20, TC11, and TC19, unless you run out of ragged clothes and are too impatient, or have too many recruits built up, to wait for tc11.
I ran 3 tc20s and 1 flex until I got so many high value heroes I clearly needed feeders more than additional high level dudes. Now I run 2xTC20, TC11, and TC19/11 flex. I keep the 20s at about 12 days (24 recruits) and the constant 11 at about 10 days (20 recruits), though I’m still working out how much of a backlog is best. I won’t run out of ragged clothes for a while but when i do I’ll do TC2 until I have more or run out of backpacks.