We've got another small spot that can handle 50 miners or so.   Its at 480/277 though and the S19J Pro+'s would plug right in and would cost very little infrastructure to speak of.

Yet I'm really struggling with buying miners at 27.5J/T vs the 21.5 for the XP's. 

My gut is telling me at the rate of difficulty adjustment for all this fucking hash that keeps coming out of the woodwork that you better be at 21.5 or better or your just going to get squeezed out.

Anyone put any spreadsheets together proving it?    Sure bitcoin blasts off who cares but I'm just not feeling it.