Warfront armor

I’m trying to get all the warfront armor for the different armor types. I have the plate and leather armors complete. I just need the 7th legionnaire’s handwraps blue grade for the cloth and 7th legionnaire’s sabatons blue grade for the mail armor. I keep doing the war front battle for stromgarde for both my alliance and horde toons, but I keeping getting a different piece or armor or if I might get it it a purple grade. Is there a way to increase my chances to get the piece of armor I want at the grade I wan’t in some way.
Plz Help