Ok, so I am finding on my ice wizard that colossus can only do 30 more points than frostbite added up and it's a pip more. Also, you have to get very lucky to get the extra 30. I think either frostbite needs to go down in power or colossus needs to go up.
Colossus' damage was increased when wintertusk was released. Also, in general, when you add up the total damage of any D.O.T. spell, it does more damage than a one-hit spell of equivalent pips. -eli and crew