For anchoring stretch in the snubber is the requirement for the smooth noiseless ride
Nylon like stretching , BUT it takes 10% or 15% of the nylons breaking strength.
So the first snubber should be long , but not long enough to get in the prop,and probably 3/8 nylon to start.
This will give the smoothest ride , but should be changed for larger when the anchor chain or become taught enough to line rise clear of the water and jerk the boat.
Not very often in a protected anchorage .
Chafe is the thin line hassle,, rubber slip on guards work fine.