You don't want to use sens that's too high for you. Feel free to turn the DPI down to whatever feels comfortable. Honestly anything beyond 2000 DPI is totally unnecessary. The DPIs are just going up because companies think they need a numerical measurement of accuracy.
I have a friend that uses 3000 DPI, but he plays like 6 hours of CS a day. As for 8200 DPI or whatever they're up to now, it's counterproductive. In order to make things usable (at default sens, dust particles on a hard surface mousepad would make the cursor jump around), you're scaling it back to a point where the OS starts reducing a large number of tiny movements to a single pixel movement on the screen and you're actually losing information.
At the end of the day, the best way to go about it is to set the DPI to whatever makes it feel natural for you. For me on my current mouse, that's 900-1000. For some people, it's 2500. Some pro-gamers use 400. Don't feel pressured to use something that's uncomfortable unless you feel lower is holding you back.
Also, 5 months since we last spoke. How are you?