Grail CFR XPLR

Hi chefs
Currently looking at the new CFR XPLR coming this october.
Im 180cm an has an inseam 83cm which puts me between S og M
Did the size chart on the old CFR Di2 – guess geometry is the same, but there I was a M
I’ve compared geometry/dimensions data from Canoyn on the Di2 and the XPLR and besides spacers an 1by vs 2by they’re pretty much same.
But why am I between sizes then?