Well, this is only a theory, but looking at my team compared to your team, we seem to have similar outside scoring, and maybe you have the advantage there. Considering that we are probably both going against similar types of defenses, I think the key difference to look at is offensive flow. Mine is normally in the inept (medium) region while yours is at awful (medium). For game ratings, one whole step is a pretty big difference...Looking at some recent games with me shooting three's, I make a pretty fair amount of them...Maybe your passing/handling isn't good enough and sometimes their defense forces you to stay at the outside?
I don't know...feel free to look at my team though for comparison as I normally play motion for league games and we're both in DV.