How geared are your shams? Now that you are in the 70 bg group (except for av which is 61-70, where 80% are 70), you are going against people that probably have s2 gear. With that gear it is harder to kill them and easier for them to kill you if you don't have season gear. Best spot to grind is 69 were the only bg that has season gear is av. But anyways you are 70 now, i say do av until you get some pvp gear. Like everyone is saying your boxing will not hurt the numbers.