I went (separately) with all 5 companions and ended up with 15 *legendary* rings and 15 *legendary* belts. That is 5 each for 6 guys.
It took a couple of days of save scumming (although I did take time off to do some other stuff) and was pretty boring. F8, 3, 1, 1, 1 > "+2 summoning"; F8, 3, 1, 1, 1 > "+2 perseverance" etc, etc
I don't see it needs fixing as even a legendary level 9 belt (of which your 4 man party can have a choice of 15) isn't going to be particularly interesting 30 minutes later (if I ever leave the island) and it takes a huge amount of effort and time.
I wouldn't go so far as to say I like save-scum generally but I enjoyed this experiment.
It was fun.
But slow.