I've seen CoA do fine for ww assas before, but the main disadvantage of it is the insanely high requirements on it, which are far higher than your suwayyah claws which are normally your heaviest piece of equipment. Also it is easy to hit 86%fhr on ww assa anyway with 50 from bramble, 10 from verdungoes, only then is either shadow dancer, shael in shako + fhr skiller or fhr/res all charm or couple of skillers with fhr needed. Or if you use Eth Bugged Bartucks with Um in you've got 30%fhr there as well