I would suggest you look at Milt Sparks Holsters. They make a couple of large print leather holsters which carry big guns well. My 5" 1911 disappears with my HR Limited(like a versa max) or what ever that model was. It does not make me hot as you suggest. I do kind of wish it had a bit of rough leather to grab my underwear and keep my pants up better. This isn't much of an issue, except when transitioning from walking to vehicle a lot.
Thumb breaks are generally reserved for where required by rule or poor holster fit. I think once you try a higher level holster like Sparks, UBG, etc, you will see why.