ohyeah I have not yet spent any time on reducing it. the free version of DaVinci Resolve does not use GPU as much (or as efficiently) as games, so coilwhine is not that bad there.
I think I will play a bit with checking coilwhine at different power limits of the card but 150W vs 130W did not give me significant improvement there.
the phantek did not work out. it was close tho I still did not give up on fitting a bit larger heatsink because a nice cut out can look really good on the side panel. I can both immagine a square one for the phantek or a round one for the stock wraith spire...