Interesting, With my color profile, the default Gamma is fine. Out of curiosity, I purposely ran it all the way down dark and played a couple minutes in Q3A and back to the desktop, Gamma was back to normal(fine).
I would assume it should hold that setting. I am also using 6025's but in XP. That would be a PITA if my gamma setting was not acceptable by default(like yours). I wonder if its the driver version?