For ground troops the king with 2 or 3 barbs is enough. For dragons/loons you need the queen as well or only the queen if you use a few barbs or a giant for distraction.
If I use a GoWi based attack I dont lure at all. This seems like a waste of troops to me. Instead I take a few valks with me to deal with them inside (especially witches) and rage up the king on contact. With a maxed king this seems like a waste but below lvl20 it seems to be the best use of the iron fist. The power of the iron fist is damage output of king and barbs and not the healing and what would be a better use than killing a lot of smaller units with it. I never use lightning because this only kills witches and archers but the wizards, loons, dragons and valks survive.

