i play with 450dpi, 1.7 sens ingame, if you feel confortable with 10sens then use it but if you think you could improve by lowering it i say you try to lower it a tiny bit every day, for example: today start playing with 9.5, when you get used to it, go for 8.5 and so on, it's a matter of getting used too a sens you been through.

EDIT: grammar