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In a dynamic clamp you are in a box:
Sensitivity / trigger time must catch the zap before it exceeds
damage threshold. This is probably where scaling comes in,
though you might be better off with active drive than raw
C value.
RC decay time must persist until the source energy has been
dissipated. Too early a release may apply residual source
energy to the part, without the leading-edge dV/dt needed to
retrigger.
A backstop DC trigger is a good idea if you have one that is
low enough voltage, and consistent enough, to be useful.
Suppressing trigger with a vdd-controlled shunt can help you
deal with high speed waveforms (not-trigger on normal
operating dV/dt).