There are anti-chafing solutions but the cheapest and easiest is to cut a couple of lengths of old plastic/rubber hose pipe, split it if necessary, and fit over the mooring warp and place in the appropriate place or slide the warp through and position accordingly.
There are also shock absorbers available from good chandlers (or on-line) and they don't cost an arm and a leg but as a Mac is light, when compared to a keel boat I don't think a shockabsorber would be much use.
You can, of course, visit a chandlers on go on-line to see what solutions are available.
I wash all my ropes in fresh water at the end of each season. Gets rid of grit and salt, makes them softer to handle and they look better and last longer. Don't put them in a washing machine though even if wrapped up in a pillow case or similar. They don't like the spin.
Good Luck with it all.