As I've mentioned earlier, I've done the WinDAS calibration, but the result was quite bad. I don't really know why, though. I've set the values till my meter read what was needed and at the end of D65 step it was great, but by the time I finished it would mess it all up. Uncke Vito mentioned one of the guns could be faulty. I would expect that that would be seen by the monitor from the values I was inputing in WinDAS and if I needed to tune some value more it would see it had to apply more voltage here, less there, etc. But I guess it doesn't work that way.