Mining for playable modifiers is a slog, as is trying to play the game with certain combinations of them.
So, why not (as with Guardian Ranks) provide a partial randomized list, and allow us to choose some?
The idea would be that each mod would alter the loot percentage based on just how favorable or unfavorable it might be. Rather than a flat 500%, you could choose mods that are less of a dead slog and settle for 325% or something.
Giving a random partial selection forces a bit of variety, but avoids simply unplayable combinations. Or just let folks pick from the whole list and get as weird as they want, with the loot % capping at 500.
(Also, just get rid of the 30% reflect - no one keeps it - and the 45% more HP and armor, since that’s covered under the base Mayhem stats, yeah?)