@Ari are you sure this is a D+ source problem?
I had to disable HDR output on my Firestick 4k too because any Netflix shows with HDR coming through that to the MoGo Pro were also way too dark to watch properly.
Couldn't there just be some way to disable this functionality? The projector doesn't output HDR anyway, so why even have it tell sources that it's HDR capable. If it didn't do that, they would then just default to normal colour-level streams and be perfectly watchable. Or is this an Android TV problem?
I'll join the FB page too. Thank you