It sounds like a bit of a slog but that is always the case with stat maxing. I tried to do this in FFVII but trying to find enough sources to max everyone would take forever. Using the W-Item glitch helps a lot but not for all the sources. I think it might have been Luck again that was the awkward one.

My FFX playthrough I was pretty well kitted out but I didn't love the game enough to put that amount of effort in.