above "C" rank aswan potentials

[Rank S] Dex and Int Increase +39INT, +19DEX, Rank 8 circulator
[Rank S] Str and Luk Increase +37STR, +19LUK, Rank 7 circulator

I got a few rank A/Bs with 5% damage on normal and 4% additional damage on monsters inflicted with debuff too, but I don't remember what the rank was 100%.

Starting to think that your honor level adds to the amount and quality of different abilities you can have, the circulator increases the chance to get higher "level" for your ability, and the "level" of the ability shows up as the rank on it.