I don't fine tune my limb tips or handle until its nearly finished being tillered. My tips never bend, so narrowing has no effect on the tiller. And I also don't want to spend time on overlays unless I'm 99% sure the bow will survive.
I've been boiling in my hooks at floor tiller, but make sure both limbs are the same thickness as each other. I like to make my tips an inch wide and 5/8" thick. Boiling makes them bend like butter, and very few tear outs