Similar machine and I am getting follow drops in AV with Crusader Aura. Not sure if the following distance places them outside the aura range. It also gets laggy in big standoffs, 60+ players AoEing etc. I've been steadily turning settings down to see if I can make a performance impact.

I have all 4 clones running on core 3 and 4 with everything else on core 1 and 2. I'll try switching all of them to all cores and see if it makes any difference.

I tried WG once, only 4 got into it, it was pretty bad performance wise. Not sure if it was because one of my characters was stuck in AV while the rest was in WG or whether it would have struggled with all 5 in WG as well. My gut feel is the latter.