This is embarrassing but I have failed more attempts than I'd like to admit on enchanting my Middle Headgear Costume. Like, around 10 times now even though all resources I can find note a 50% failure rate but that seems too low for the amount of failures I have seen.
Are there different maths for specific costumes or enchant stones I am not aware of? Last time I played I enchanted numerous costumes with cheap ATK Stones first try (including the one in question), but getting a "Sniper Stone (Middle)" on it seems impossible to enchant!
Do the RNG gods just hate me or am I missing something?