Hi, thanks for sharing these vids. I am not the expert here, so plz don't take as any offense if I say that all the vids look the same for me (sorry - I'd say, even a bit ugly).
I see there is not big difference among these short clips shot under specific conditions (cloudy/foggy, ISO 100, speed 100...) I think we all will have to sadly accept that Mavic camera has some limitations for sure (focusing issues, redhot spot, warmer central area of the screen etc.). From my point of view - the filters do not make the video much better in this particular case / turning conditions - not talking here about bright shiny days over snow or water!
BTW I have bought the TACO RC set 4-32 (not polarized), and got exactly the same result, I am looking forward to sunny weather - finally to have chance to use them fully.
There is another issue I noticed -
the watercolor effect (what is mentioned here in other threads somewhere). I think you have it also on your footage, since the vids look like not sharp/focused enough... this can be solved (unfortunatelly only for a short period of time) by switching to NTSC and back to PAL. Than the watercolor disapears and for a short time (not sure for how long exactly) there is a brilliant sharp image! (OK under these conditions at least a bit sharper...)
Conclusion? (Just my guess...):
Under cloudy/foggy conditions - filters don't help much (unles you want to reach some special abstract ART effect), with Mavic I alwas have to focus on the focus
(and NTSC/PAL switch helps to improve the sharpness and gathers some detail from the scenery)
Feel free to correct me if I am wrong.