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If you are going to go to the trouble of installing new insulation, you also want to check that the air channel from the soffits is not obstructed. We find that the space above the vented soffits is often obstructed by solid wood, or by blown-in insulation.
You are also right in observing that the only way to change the insulation in your roof is to go either through the ceiling or the roof. So if you believe that the cure is worst than the problem, it looks like heating cables are the current solution for you.