Thanks.
IMHO the three main problems to solve are.
1. Chafe (mainly at cleats, fairleads and against bobstay wire. ).
2. UV damage to your ropes/strops.
3. "Twisting up" when the boat _mooring attachment doesn't swivel/turn properly as the boat rotates around the mooring. This can result in a "Spanish windlass" type of loading effect on your cleats/fairleads as the ropes/strops shorten. NOT GOOD!
It can also cause the bow to be pulled down into the water, as the strops shorten. Similar effect if the riser chain
attachment to the buoy does not Swivel.
Ease corrosion problems by buying quality parts (NOT ebay tat, Cheap Chinese swivels and shackles _ I try to use stuff certified for lifting, from a reputable UK firm). Use as big a size as will physically fit. Parts rated for lifting (often referred to as "green pin") will be automatically oversized for "pulling" duty.
Jimmy Green Marine are good (they publish a mooring guide too), as is lifting-slings (10908) on ebay.
Beware "mixed metals" eg stainless with Galv.
Mouse all shackles! Ideally with monel wire, but even our Harbour Co moorings use cable ties nowadays.
Remove your topside mooring system from the buoy over winter, and store it at home. Amazes me how many folk just leave it all rattling round their buoys for months. When I used to lay my own mooring, I used to "swamp" the whole thing over the winter (take the big buoy off, and drop all chain to the river bed), lasts much longer.
I've witnessed at lot of failures over the years...only a few of which were mine! However, the only time my boats have been damaged was when someone else's broke free, and tangled with mine in v strong winds.
Hence my prattling on at length on this topic!
Some good advice here, from an YC on the Tamar with big tides.
https://www.cargreenyacht.club/moorings/Download the mooring guide
https://www.cargreenyacht.club/resources/downloads/MOORINGS_AT_CARGREEN_June_2016.pdf