HQ item oddities

[gahoo]

We have been investigating the bonuses on HQ items, and there appears to be a nice and consistent equation that dictates an increase (20% but not less than 1) to a single stat on a crafted item - that is except for a mere three exceptions, which have a 30% increase:

Pearl Ring (Magic Crit Rate+7 -> +9)
Black Pearl Ring (Magic Crit Rate+10 -> +13)
Coral Armillae (Evasion +8 -> +10)

Now maybe this in intentional (and yeah not a LOC issue, but maybe not a bug either), but seemed strange enough that it warranted a post where I can be assured it will be seen and addressed.

EDIT: all credit to wiki editor Jerynh for the above research/discovery.