Oh my god I've been slamming my head against this for hours and for some reason it's all working now. First they wouldn't bind, then they wouldn't all show up in the tester. Now they all show in the tester and bind perfectly, after redoing what seems to have been the same steps over and over. Typical.
Thanks for the input, though.
Now I'm trying to see if I can turn the E2 encoder dial into a rudder trim axis, but I might save that for another day and get to actually flying.