As the original screen is way too low for some-one 1.85 meter tall, i put a Higher Faco screen for a sym mio on my CPX, fits perfect.
Also covers the hands a bit.
Just get old screen off. Meassure new screen and drill holes (carefully!) in the screen at the right place.
Then hassle a bit with some rubber rings to make it fit and slightly tilt backwards. Works very well.
I am slightly taller (2.0m). The stock wind screen is not doing all that much for me. What I am wondering: Is the screen you mounted more upright than the stock screen? If the stock screen would have been any longer it would hit my helmet all the time, so mounting a bigger screen under the same angle would not be helping me.