I use g602 and normally run on 800-1000 dpi anymore and in most games like siege it becomes to fast almost choppy

also what does the diagonal acceleration and in game acceleration settings do. I cant find anyone explaining in detail

These settings add acceleration to your mouse movement, this can be used if you need a higher turning speed. We always recommend to try to use as little acceleration as possible because your movements become less consistent when adding acceleration. Now this can also be used with games with low turning speeds to make the mouse react better.