The only problem I've had with the bump method is when the mob decided to keep aggro on the main, but continues to walk thru them to get behind (think we've all seen it a few times at least) with the run-thru on the main, I just use mouse turn. With a 3.6 speed weapon, theres lots of time to get turned around before the next swing happens, as with the macro I have, the instant attacks happen as I'm initially running thru the target. This also helps the main be in front of the target, while the alts get to be parry-free in back (till 1 crits anyway).