First off, low sensitivity is bad. It is recommended to use the highest sensitivity that you can control perfectly, so 50cm is just absurd. You should say use something between 30-24 cm/360. Maybe 35ish for games that doesn't require you to turn as much, such as counter strike.

Secondly, if you want a cloth pad, you should know that the fastest you can get will still have some control. I recently bought mm350 extended and I'm very, very, very happy with it. 10/10 recommended.

Between the ones you listed DO NOT GET G-SR. You can get G-SR SE but non SE is the stickiest pad on earth, I used it. You should explore other options. Wouldn't really recommend 640 or qck either. If those are absolutely the only ones available, would get 640.

Also if you want less friction, get hyperglides/corepads mouse feet. It will make it smoother regardless of the pad.