Well that depends totally on you chika. If you feel that you are ok on 8mg and wanna experment with 10 give it a try. But be on the watch for any sides that you dont wanna deal with. As soon as you start to feel off or notice other visual things....that you may not want, knock it back.
Or if you are happy with the results that you are getting now then just stay right where you are.
Thats the thing about all of this its so subjective per individual.
Good luck with that.
Gr8 log and keep posting!