An IT of 200+ is too done for me. I want Pull Apart, bite through slices, not falling apart. Pastrami can be tender from 170 to 190 without being mushy. The Smoke then Steam is what Deli's do to Smoke/precook many pastrami's in one day and control the amount of smoke the owner wants on the meat. Smoked to 150 they are cooked but not tender. They refrigerate the mostly cooked Pastrami, then reheat and finish cooking with steam. This traditional Deli method got carried over to home prep but not necessary, unless you want a light smoke flavor or are cooking ahead. If you are making one or two Pastrami's for home, that will be eaten when done and like them smokey, Smoke to a tender IT you like, eat some hot and refer the rest. You can steam to reheat, 150°, in a pot over simmering water or a covered pan in the oven. For hot Sammies, slice and pan fry...JJ