F30 or F31 there is a difference !.opposite exposure issues

[rodo]

Has any one tried both , I have noticed the F3I underexposes:? a lot sometimes if there is any sky in my shot,whilst the F30 overexposes in general:? , I m going to sell one of them because they have to be constantly adjusted differently DOH .Ithink I prefer the F30 seems better to just reduce exposure by 1/3 or if very bright 2/3 while the F31 is not so predictable having to up the exposure by more than 2/3 like 1 or even 2 . Any one find the same issues with these twoor have work arounds ? ,