Get a 1 or 2 flute countersink. Otherwise, slow down the one you've got, and if
that doesn't work, add a bit to the speed.
I'm not sure "cavitation" is the word I'd chose, either. Does it form bubbles
or pits? Roughly, I'd guess it just roughs it up more than you like.
"Politics: A strife of interests masquerading as a contest of principles. The
conduct of public affairs for private advantage. " Ambrose Bierce
This is a common problem when a multi-fluted countersink bit is used in a
hand-held drill. Using a drill press (clamp the workpiece) helps. A
single-fluted countersink or a Weldon-type bit is nearly essential when
countersinking with a hand-held drill.
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