What are you using for your docklines? You mention nylon but that may not be the best rope
Nylon has a bit of stretch in it which can be good from the point of view of shock absorbance, however, if the boat is too heavy or the docklines too small then its like you've tied your boat up with rubber bands and it can bounce around the marina berth like its on springs. If you don't have enough room in the berth the stretch in the nylon lines can allow the boat to hit pilings, fingers, etc anyway.
All of the marinas
here use polyester 3 strand as an economic and safe dockline material that has a small degree of stretch, adequate strength, excellent chafe resistance (particularly when wet) and ease of splicing.
I've just made up a set of docklines for our 14 tonne yacht from 16mm (5/8") polyester 3 strand with eye splices both ends of each line. No whipping, no goo ..... shouldn't need it with good splices. Each splice is tapered with one leg tucked 5 times, one tucked 6 times and the third tucked 7 times. Neat, tidy, strong.