Actually maybe worth sharing now; @DMDreview when you get some time if you could compare normal LLDV vs HDR for LLDV it would be appreciated to make sure I am on the right track.
This is built on my VS10 base, with an additional setting:
Use HDR output for Player Led
Note: for this build VS10 for Dolby Vision is back active for all profiles, though goes without saying should leave it off for the testing.