Quote from 1a2b3cppp:
are you saying if you're making a horizontal box to make it as short (height) as possible because if price is going to touch, say, 100 from below, it doesn't matter if the box goes from 100 to 150 or from 100 to 110 because it's still going to touch at 100?
Unless it's gonna go way above and then drop in from above, in which case height might matter.
Did you compare it to twice the delta of the vanilla at strike=touch price?
