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In a general sense at what point do you declare a screen is walking the edge of a razor?

I think it is partly that, but partly that the screen simply has to
be redesigned if you add another filter. There aren't that many
"safety=1" stocks, so any other filter cuts that down a huge amount,
and the two cutoffs of 20 and 5 probably have to be changed at the very least.
A lot of screens aren't helped by more filters, since they rely on
getting the absolute extremes of the one thing they're looking for.
When you cut down the number of stocks among which it is comparing,
the benefit of the "extreme seeking" fades. So, this result of
nothing else helping is much more common than you might expect.
The screens that get posted here are usually played with a lot before
getting posted, and the screen designer often stops when he/she has
run out of things to add which help. As an excercise, try adding
an extra filter setp to the start of a few of the standard screens---
it isn't often you can find something which helps.

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