This is complicated to answer, but I'll try...
I started with very high DPI, such as your old DPI, maybe even the same DPI, if memory serves. I'd say that anything above 1000 can be considered extremely high, and probably unstable for most players. I too wanted to move down to something with more control and stability. The main issue in switching down, however, is that 1200 vs 1100 is a relatively similar play style: you're still using your wrist for most of your movement, and you're probably actually sliding the mouse more with your fingers than your arms. I'd guess that anyone playing at this DPI has to be using a a finger tip grip or claw grip. However, 1200 vs 600 DPI are radically different playstyles. With 600 the majority of your movement is arm movement with wrist movement to back it up, you're probably going to be forced to use a palm grip, or an extremely palmy finger tip grip (not advisable), and you're going to be using totally different muscles than you did with the 1200 DPI. This means that to switch so far down from so high up is going to be extremely difficult on your muscles and your methodology. I'd advise that you gradually move down step by step in 100 or 200 at most intervals of DPI. Do not switch down again until you see yourself getting better results than you used to and on a consistent basis. Your muscles need time to understand what they are adapting to, and you need time to understand how your method of playing needs to change now that the mouse is essentially a whole different creature than it was before.
It can take me many weeks or even many months to drop my DPI when I am playing regularly, i.e. every day or every couple days. I always wait until I feel that there is no possible way to get any better without the control that even lower DPI will give me. If you switch too quickly, then your muscles get confused and you end up losing valuable lessons that you might have learned if you took it slow.
This is my opinion and method as an ex competitive player.
RaneFire wrote:
#3: Grab a steelseries QCK+ mouse pad and pull it to the front edge of your desk. Being a thin pad it does the job better than thick ones so you aren't chaffing your wrist.
QCK+ is a beast.