CRU vs Benq E 2200 hd

I upped the refresh rate with CRU to 70 and 75 Hz.

It seems smooth, but it looks horrible. Everything gets blurry/thin, especially text.

I wanted to add a screenshot, but if I take a picture of it using the "print" key everything looks completely perfect on the .jpg.

I don't know if I am doing something wrong, or it's just the monitor.

This is what I did.
- Open CRU
- Add detailed resolution
- Change refresh rate to 70/75
- Doubleclick restart64.exe
- Monitor settings -> select 1920x1080 @75/70 Hz.

Maybe my monitor can't handle it?

Setup:
Benq E 2200 HD (DVI cable)
Radeon 7870HD (Driver Crimson 17.6.2)
I5 3570K @ 4.3 GHZ
Win7

Thanks for the help in advance