it seems to me to problem is in the followers not getting in range, so wouldn't a good solution to this be 4 pseudo spread out key binds. instead of spreading out the group, get them all to more forward, turn right, turn left, and back up.

so you would basically be controlling the master with the 4 slaves following. than bind I=move forward, j=turn left, k=backup, l=turn right to make sure your slaves are all facing the right direction.

would take some micro management on mobile mobs but would this work.