Is the sizing chart for the current Sweet Protection Rocker Helmets accurate? I have heard a couple complaints that the stated size was too tight for some, I'm just wondering if it was likely human error. I am planning to order one this week and can't really afford to order 2 different sizes to try right now so I figured I'd ask here. My head circumference is 23" and I'm pretty certain that I don't have an abnormally round head, so what would y'all suggest? According to their charts I'm a M/L with .20" of wiggle room.