I think I've spotted the problem. I think the calculator is outdated because it lists the maximum sensitivity as 20. Whenever I try to get my correct sensitivity which I know from trying it out should be around 24-25, the calculator breaks and doesn't want to display it because it thinks the maximum sensitivity you can have in the game is 20.
Sensitivity 1:
Too high sensitivity or too low new DPI
360° rotation:
Recommended new min DPI: 1100 DPI
The calculator flat out refuses to display any result above 20. http://i.imgur.com/l1ympaR.jpg This was probably caused by the earlier build of Reflex having a max sense of 20 but these days the maximum the slider goes up to is 50. Which means Reflex have completely changed their mouse settings. If you could look at it again and update the calculator that would be great.