not sure how you setup your groups vs raf but you may want to double check you're getting the raf bonus xp on all toons when you change your groups setup to do 5 mans

why do you need so many motherboards ? you should be able to have at least 4 wow per computer (I 5x box fine on 1 laptop) so at most you should need 7 computers (if somehow you wanted only 4 for display reason and 1 "main' alone for eyecandy reason)