While keeping in mind that this figure doesn't apply for the arena due to lvl nerfing.
+2 all set affix for the arena is now only a +1.
So in order to cap arena stats, you need to over cap in PvE.
This is why it's important to work on two builds if you ever want a build to its full potential. Your first build being an easy one to work with when toggling items for the arena and PvE. This prevents waste of stat space as well as defeatism.