Assuming they fix the abs decay and the super high resist rates to dark magic I can say that having 15% or higher absorb-speed wouldn't be broken, it would count as magic haste and it would be a debuff as well, plus add nethervoid for even more, that makes drk more usefull. Ya some jobs may complain about drk's self haste, but as its been pointed out blu has haste, besides /whm and soon /rdm will have haste, which means easier to get other ppl haste. I for one hope that is abs-speed is implemented then it should be stackable with haste/march/slow to make drk more useful, or else it will be one of those niche spells that whm will love because they don't have to haste the drk lol.