Both my worthy collaborator and I have battled physical and mental health challenges (I'm going in for more surgery Thursday!) over the past year or so. It has caused some delays, and yes, we've had to pad our buffer with some filler to give us time to recover and catch up. Still we only managed to skip one week, which, given our struggles, I feel is a pretty big accomplishment. As for feeling inadequate, I feel that whether or not we get the kind of success I'd feel is most ideal, we're still doing good work. That's motivation enough to continue. That, and I hate quitting anyway.