Ok here's the deal: All DoW except Archer has two kinds of combo, one starting from front and one starting at the back. It's quite obvious that the one starting from the back deal more dmg but harder to pull, and usually is more feasible to pull out in pt fight where the tank can hold constant enmity to put the target static. However it is not impossible to do it solo, I've pulled out Chaos Thrust combo relatively easy soloing and notice a few things:
You should only move right after you get a hit from the mobs, that way it doesn't face you as quick so you can hit it from behind/rear easier.
Do not use target lock, it's terrible. No idea why it's default on, I set it off from day 1 in pre-release. Free camera movement allows you to move to the side much quicker.
Some obnoxiously large mobs like the toad is harder to pull this off, simply because it's so big that it blocks your view and you can't see where your character is when you move behind/beside it.
Don't do combo macro lol, that would be the last thing you want to do. You would want to throw in buff like Blood for Blood and Keen Flurry before the final big hit anyway. Blindside doesn't affect multi hit anymore so half of the combo it's quite useless.