have you tried this:
also: you should use video levels (most formats use it and if you override more shifts are likely to happen)
resolve changed the underlying engine and now works better with apple's colorsync.
also: the viewer in resolve never shows the accuracy what an output via decklink would. sadly but that's how they get you to spend money ☺ also, most formats are also rec709 gamma 2.4 – you should use resolve's standard project settings about color which uses this automatically and compensates for your 2.2 system.