Weapon stats

It's in comparison to what you currently have equipped, they only go into the negatives if they give you less of those stats than what you're already wearing, so for example, if you're wearing a weapon with 30% Boss, and you scroll over a clean, unpotentialed weapon, the boss damage field would display "-30%" because wearing the clean, unpotentialed weapon results in you losing the 30% boss damage from your current weapon. If you're wearing a 70% boss weapon and you scroll over a weapon with 30% boss, it would display "-40%", if you have no boss damage on your weapon, and you scroll over a weapon with 35% boss, it would display "+35%". It's the same for all the stats except for Ignore DEF because that's kinda complicated, since it's multiplicative rather than additive.