I'm no expert in the theory, but here's what I do when events like yours
happen.  I start by putting a piece of wire (no resistance) where you have
the resistor today.  The boom should stop moving completely and freeze in
place.  Now start replacing the wire with small resistances, gradually
building up to what you need.  The higher the resistance, the less damping
you will get.  You can use a variable resistor for the adjustments, but
don't use it for the final construction, too noisy.

Ted Blank in sub-freezing Portsmouth



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