I found the error now, you have used the mouse sensitivity on the axis multipliers as well, these must be set to 1.
You have this:
<Attr name="MouseSensitivity" value="0.511963"/>
<Attr name="MouseSensitivityX" value="0.511963"/>
<Attr name="MouseSensitivityY" value="0.511963"/>
Change it to:
<Attr name="MouseSensitivity" value="0.511963"/>
<Attr name="MouseSensitivityX" value="1"/>
<Attr name="MouseSensitivityY" value="1"/>
And it should be spot on