I am .99 sure that you had your slider on the 3.5 position. :\ Why did you remove the image, which showed that? >.> There's nothing wrong with that DPI... Don't worry if this guy says 450 is better. I personally use 750, and I feel it's a very low DPI for me, and fits me at the moment. I may go down eventually, but not right now. Although, I admit it's hard to read the slider on the Razer sensitivity. Maybe we're both seeing different things because of where we start on it. I take 10 to be 100% and then go down by increments of 5. Are you starting at .5 as 5% and 1 as 10% and going up? I think that must be how you are reading it. The slider technically does not have enough room for a 100% scale. If you read the bottom mark as being 5%, then the 10 position is only 90%. Very awkward, and can't be right. If you read the top mark as 100%, though, then it makes more sense, since you can assume that it does not allow for you to take less than 15% of a DPI base. I always found that an oddity. Maybe that's where the confusion is.
About 1000 polling rate, it's always said that it adds strain to your CPU, but on a modern computer this strain is minimal. If you can game on it, then the odds are that it can take it without breaking a sweat. I am not sure about the veracity of claims that it causes mice to drift. I've personally never noticed any difference in drift between the different polling settings, and I normally get very little. My philosophy is that it speeds up the reaction of the device by something like a millisecond, and while that is very small, I am willing to take whatever edge I can get. That's just my philosophy, though, and there's no shame in using 500 on that either. However, I'd be very interested in seeing any proof of mouse drift at 1000.