Manni, a small data point for you:
I had measured a gamma droop on my RS4910 a few months ago (http://www.avsforum.com/forum/139-d...ay-calibration-software-152.html#post28129242). A few weeks later (once my Spyder arrived) I was able to run the JVC autocal on the greyscale+gamma, after which the droop was gone. Unfortunately I was in a hurry and so I did not verify the gamma droop was still present immediately before running the autocal, but I do know afterwards I was able to confirm with my i1D3+HCFR that the droop was gone. As I was in a hurry (young kids) and also am not too experienced with calibration, I can't say what, if any, impact the autocal may have had to other performance parameters (e.g., max calibrated lumens) to correct for the droop.
To add, I recently needed to factory reset my JVC and so I'll be working on re-calibrating it from scratch over the next weeks -- I'll start with the JVC autocal (maybe its drooping again!), and so I'll keep everyone up to date. I do wish the documentation for the JVC autocal software was not so terse; in particular, Harry's description of needing to calibrate for different iris,cmd,etc settings (http://www.avsforum.com/forum/24-di...3203-jvc-auto-calibration-3.html#post24486923) is completely non-obvious from the documentation.
Also I just picked up a Lumagen Radiance XS3D and so I'll be playing with that too, although initially only with manual CMS/gamma tweaks -- I have not yet picked up a Calman Enthusiast license for the 3D LUT, anyone know of a good deal for a license?
When you redo it, please make a note of the exact settings you use, and please provide a screenshot of the three screens after the calibration (gamma, color temp, gamut).
I've tried everything, and while the gamma calibration does something, it doesn't do good only (black crush due to wrong value at 5% white) and not enough (most of the droop is still there after the correction.
I've wiped the small corrections it had doen (went back to factory settings and only added the color correction) because the JVCs really don't need any added black crush.
You should call/email spectracal sales, they are good guys, ask them for there best deal, it's worth every penny .