I like the fact tempering mods are powerful and build defining and I like the fact there’s some RNG involved. But that RNG should be the difference between a good item and a great item, not vendor trash or a great item. So I propose they make the manuals just single mod, but then increase the range within that mod. This way your still rerolling to try and get a perfect roll, there’s a game of risk with if it’s worth trying again to get a higher roll but that risk doesn’t involve completely bricking the item.
This fixes 2 issues, 1. It means your not just straight bricking your item and 2. It means your more likely to retry for a better roll rather than just being thankful for w/e roll you got as long as it’s the mod you want.