I had the same dilemma before I recently bought my OCR. I'm 6' 2.5" and a 35" inseam. By the website's advice, I was a Large. But I went to the LBS, and tried both sizes (the XL was atually carbon...what a tease =). After riding them, the choice was incredibly clear: I was an XL. On the Large frame, I felt all "scrunched up".

But inseam isn't all there is to it. The butt-to-crank length is the easiest thing to adjust on a bike. The real key to frame sizing is top tube length. The reach can be adjusted to some degree, but stem changes happen in larger increments and aren't as easy.

So, in my experience, it was the reach that set the frame size. Since you appear to have an even longer torso proportionally (based on your similar height and shorter inseam), you'll probably find the same thing. But arms have a lot to do with it too. I have particularly long arms, and that's not an insignificant contribtion to my overall reach. Bike fit is a very personal thing, but there's no better way to find out than to try them.