The problem with castling is that you generally cannot castle far enough away to make mobs that have aggroed on you drop on the homunculus - they will usually stay on you.
And as for mobbing like no other. I once made a 50-60ish Slaughter mob with my vanilmirth because homunculus flee doesn't drop due to mob size...so it was 95% fleeing all of them. I had to res it once before I got it to the claymore trapper ready to kill them.
