before trying reset try teh logi software. found a starange one that helped me...
In the software axis screen set the curve to the opposite of what you have, either "S" or "J" curve and apply.
Then set it back, try calibrate button again and see if it works to regain the 100% limits.
If that doesn't work, you can try the reset or possibly another USB input?
the regedit can be a sticky thing because it could cause issues with other items in Windows.
Good Luck!