If you think the frost debuff shouldnt get nerfed stop talking and keep doing your 10s. On high keys it ticks good 8-10k/second.
I've noticed that a lot of healers either have trouble healing through Biting Cold, or they are unaware at just how hard that ability hits and didn't know that they should be focus healing that target. As for the fire tormentor, I've only noticed the burn damage being an issue if the fight is taking too long or if people are dying because he isn't getting interrupted.