I wouldn't worry. I set my brightness at 51 to keep the blacks true. Anything over that gives you light spots on 0ire. But I can barely set the 17 bar and the 18 is very dark. As far as I've heard from calibrators, that is the way it's supposed to be. I calibrated my isf day to 60ftl with all delta e's for grayscale under or around 1. And color was all under 3 with most between 1 and 2. My gamma is ruler flat to 2.2 with the exception of 5ire and 10ire are close to 2.18. Isf night at 45ftl is ruler flat all the way down. You can definitely get a lot of light output and a reference picture, it's just a pain in the butt and takes a lot of time and patience. This set has excellent shadow detail. Just poor uniformity on test patterns, not regular content. The tips from Chad are extremely helpful(Thanks Chad!) and seem to be the only method for accurate and repeatable results. I'm not a seasoned calibrator, I only calibrate my 9g pioneer a couple times, and that was a piece of cake compared to this. But with a couple nights in 2 to 3 hours sessions I was able to get this thing dialed. Once you do this set is absolutely incredible. Calibration is a must with this set.