Readers;
Here is one cure, I bought an East German Map case(for another purpose) and I use the dark brown Nylon,Plastic(?) strap for my sporran. The strap has a metal post and a few holes in the strap, to make the size wanted. Nice and soft on the wool kilt too! No 'wear marks' rubbed into a kilt from a "Harley Drive Chain" that some folks wear!
Also, a tip from another kilt wearer I know; He has leather covers over the snaps. He folds the leather back, snaps the clip , and folds it down over the snap, it seems to work.