I can't seem to find any fitment info on the HSGI core plate carrier. I'm 5'6,120 lbs. I found some info online about plates and from my reading of how to measure chest, I have like a 8-9 in. chest?, roughly a 11 in. front center-line. It seems like the small SAPI plates would be too small and the medium would be slightly too big. I dont have a long torso, nor do I have a wide chest. I just dont want to spend money on a guess and then be S.O.L.