One ice damming tip I have is nylon stockings filled with sidewalk salt. Fill a knee high stocking with salt, tie it off and lay it across the ice dam. It will melt its way down and create a channel for water to drain away.
Other things I have done: ice guard membrane under the bottom few courses of shingles (think this is mostly standard), tons more ventilation and when I added more attic insulation I had them put better shrouds around all the pot lights. My attic is always nice and cold now, and after years of trying to get this problem solved I have finally had the ceiling repainted because I think I have it licked.
And of course by mentioning it I have just massively cursed myself I am sure.
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