a potency of 100 over 15 seconds or 50 over 30 is the exact same ending results. It might change the course of the fight or it's use slightly, but the end result is the same. Besides, WHM is not my main for coil, blm is, and I'm still at the start so I can't comment on T4-T5 from any perspective. I'm just using maths here, the final potency on medica is exactly the same. The pratical side of it is different, i'll grant you that.