I’m looking at a MR pop up 28 for whitetail hunting. My torso measurement is 18-19”. A S/M shoulder harness is 15-20”, and a L/XL is 17-24” so I fall within both of these sizes. Iv emailed and called MR customer service and have not gotten a response. I’m 5’8” and around 190#. I wear a 34 pant so I know I need a S/M for the waist belt but unsure what size to get the shoulder harness