I have Morton's toe as well. I don't think the insole will resolve that problem; you need that spot punched out.
OR, you may need to seat your heel back further in the boot. Do you force it back against the backstrap all the way?
If not, try that before lacing up - it'll move your foot back to the proper position and buy you some space in front.
Thanks to Plantar Fasciitis in both feet, I haven't had Klings without leather-and-foam insoles in many years. I've never seen extra-thick leather insoles, although I do love the feel of leather under my foot. I'll have to ask him to do that on top instead of underneath the cushion next time.