I have the PGY ND32. No color cast issue at all. And I'm super aware of this. If there was one I'd notice it.
I film in dlog -1-3-3 and use the free LUT from Ground Control' website "dlog-1-3-3 to rec709" in Premiere, then usually hit 'Auto' exposure in the Lumetri panel under the basic section, then tweet from there. Works really well. You can also add the 'fast color corrector' effect with its eye dropper if you want to make sure your white is spot on after all that. It usually already is perfect though.