> Seems a little less-likely to be the problem, given(?) as well that you have 
> fairly consistent (is deterministic overstating it?) behaviour.

Yeah.  We've gotten to the point now where enough layered problems have been 
cleared away that the remaining behavior is quite deterministic.

> If you wanted to test it by experiment, without having to remove the 
> installed Rs, you could test-clip another R in parallel with the 38.4K, 
> probably something around 200K, to shorten the 555 period.

Yes; and I think a quick solder tack for that would even be easier to manage 
than clips in there.  Will give that a go this weekend.

  cheers,
    --FritzM.

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