Is there any surefire way to get this enchant? My level 65 Breton has started having a little trouble with chaurus hunters and falmer shadowmasters.

Don't think so. Its just one of those fairly rare enchantments - like waterbreathing that you just don't come across that often. A few items have it, shrouded armour and saviour's hide - but I'm pretty sure you can't disenchant either.