wrote:

It is my understanding that ice forms less quickly when a propellor
turns faster. If you want to descend quickly (low RPM) would the prop
icing up and be a problem?

Don't know the answer to the icing question, but if I want to descend faster
(vertical speed) I go to *high* RPM. More drag and you can point the nose down
more steeply without picking up as much speed.