As suspected in the previous post, the foot spring in the detent is driving the insane need for weight in clock 3. I thinned it some more, and the required tangential force on the center wheel dropped from 3 lb to 1.5 lb. So that's heartening. The detent is now super delicate!
Additionally, since the weight requirement was lessened, the speed of action was reduced. I therefore caught the escapement fouling... It seems that it's not that the escape wheel teeth are spaced incorrectly. However, the detent releases the tooth early sporadically. I think this is made worse as the spring is made weaker, as the detent isn't sitting in its banking. The early release appears to occur more-or-less consistently at the same escape teeth, so perhaps they're slightly shorter than the others. In any event, I had filed the detent pallet a bit and now regret doing that!
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