Hola,
I'm 6'5" and ride the XL and the size is good, I rode a Specialized Levo XL and they are similar in size.
The difference between the L and XL in the RM is 30mm longer on the Top Tube. 38mm longer on the Seat Tube, 27mm on the Reach, 9mm on the Stack, 32mm longer in Wheelbase.
Your...