The hell-tier bow transmutes Frostburn Arrows into Fire Arrows. The damage that would be lost from moving back to Dark Biome bow would essentially negate any bonus from using the Frostburn Arrows. Really, the DoT is just a bonus in addition to the extra damage. I'd still use Meteor shot for the ability to do double damage.But if you are doing that much damage with the bullets, the debuff isn't going to play any real part in the kill. If you want a debuff that does actual damage, use frostburn arrows. You can get then a LOT earlier too.