Lines creaking, halyards clanging, water slapping the hull, the occasional wave banging on a reversed chine........it's like a white noise machine that tells me I'm boating.
I believe what you're hearing is simply the line stretching. snubbers are great when you have an all chain rode, because the snubbers decribed by SP will be made of line and will also stretch. This reduces the banging you would get when an all chain rode comes on tension. however, I think you'd simply be swapping which lines on your boat are stretching and 'creaking'.
I wonder if a Kellet (Anchor tender) would reduce this issue?