So guy, as far as I know, the Zowie AM has highest perfect control speed (without any neg/pos accel before it) at 500hz, or 2300dpi 1000hz.

The settings you wouldn't want to use are 450/1150 dpi at 1000hz, because of neg/pos accel at some point and then malfunction at about 2.2m/s.

I was using 450dpi at 1000hz, but recently switched to 500hz. It's not really 500hz tho, more like average 680hz.

So, guys, I have 2 questions :

1) Is it normal that the 500hz setting is more like 680hz ?
2) What settings would you recommend to me, 2300dpi at 1000hz or 450dpi at 500hz ?

By the way, if I play at 2300dpi, I will have sensitivity 1 (16cm/360°), but if I play with 450dpi my sensitivity will be 2.8 (30cm/360°). I played with 30cm/360° for more than a year now.
And I don't want to use the 1150dpi step, so it will be either 2300 or 450, but not 1150.