What are the foot lamberts at 100 percent white with the lamp on bright (2D a)? Also the whole thing is an academic exercise if you don't have at least 200 hours on the set, 300 will be a lot more stable. I have the benefit of a DUO so I have 10 point grayscale and gamma controls. It is still twitchy.
Samsung 78" JS8600, Mits WD-92840 43" Samsung 43ku7000 - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
58" Panny Plasma -DVDO DUO, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba