The standard set has a bad ev spread. You should put the 2 "leftovers" in speed, as with this set they will result in a boost (at least that is what the teambuilder says)
The two "leftovers" do not change anything:
128 HP / 252 SpA / 128 Spe is the exact same thing as 128 HP / 252 SpA / 130 Spe.