So, I tried every possible single setting. From 450dpi 500hz to 2300dpi 1000hz. So far I haven't experienced any major differences at all at those different settings, I mean, 450 dpi 500hz just feels the same as 2300dpi 1000hz, only thing you have to do is to change the quakelive sensitivity ofc (when playing at 1150dpi, I go with sens 1.2 = 29cm/360°, when playing at 450dpi I go with sens 2.8 = 30cm/360°).

I've read somewhere at overclock.net that it's better to use either 500hz or 2300dpi 1000hz, to have better tracking and higher malfunction speed. I tried to look again for the thread where the user tested the AM/FK (exact same sensor and configurations) to death, but couldn't find it anymore. I'm not completely sure but basically what came out as a conclusion was, like I said, using 500hz However I can't remember if it's recommended to use 1150dpi, even with 500hz, because of the probably "too low" malfunction speed, but like I said, I'm not sure, I might be wrong there.
I changed recently to 1150dpi because I like the cursor speed on windows and starcraft, not too fast, not too slow (with windows sens at 1 ratio, 6/11). Also, even with this setting I can still play quakelive at ~30cm/360°, with a sensitivity higher than 1 (in some games like cs 1.6, css, half-life, you can't have a sensitivity < 1, that's why it's important for me to keep it at at least 1, so that I can have the EXACT same sensitivity in all these games including quakelive).

So, I'm asking you, is it OK to play at 1150dpi 500hz ? Is it almost the same as at 450dpi ? Or should I stick to 450dpi ?