I was questioning that myself honestly. With this spell and /NIN you would at best hit 45%, NIN gets 35% at 99 so RDM would be ahead. Not sure how to balance it out without nerfing it, unless they can somehow make it so that you only get delay reduction from 1 source. If the trait is more than the spell if giving you, the spell is nulled, and if the spell is giving you more, the trait is nulled. Though that seems like something that SE would have a problem doing, so I cant exactly say how they should go about messing with that. Another solution would be to just make the trait more dominate, and the spell only work if your trait is 0, that seems a bit more workable, then if your /NIN or /DNC you cant use the spell, making it worthless as /DNC, but still a good trade off if it works otherwise.