So, I've done some crafting for UVs, and I've gotten a few low bonuses - some in useful areas (elemental defense) some not as useful (extra damage vs constructs, on a weapon that I didn't intend to use much against constructs). I know that 10% of the items that are crafted get UVs. My question is how common medium and higher are, among the various UVs that are crafted. Is it even worth continuing to craft in hopes of a medium? Is there anything that influences the chance of getting a better bonus? Does anyone know?
Just from personal experience, I've probably crafted around 50 random items... helms, weaps, armor, shields. I've gotten a few mediums, zero highs, zero very highs, and one maximum. Many very low/low. Maximums are extremely rare it seems. But to answer your question... yeah if you just want a medium I'd say it's worth the gamble.