During the dragonhold patch they kept the cost low for Winters revenge and related morphs with a developers not they wanted it to stand out as a dot so it was considered something outside their standard.
now they lowered all the aoes back down so now, winters revenge is just on part, back in line with all the other aoes.
So, are you going to stand by your developers notes that you wanted it to stand out compared to other aoe dots? or you just going to ignore you did that last time and hope no one noticed.
You need to adjust it to stand out again, either raise the dmg or lower the cost more otherwise you just tossed your "developers note" from last patch.