I ride a large and am 6 feet with a 32-33 inseam. 90 mm stem. Fits perfect. I have always been a large in Yeti frames. Even on the 66 and 95, same size...large. Large 06 575. Large 7, too. If you like the fit of your 575...go XL.
Get a bicycle. You will not regret it, if you live. ~Mark Twain, "Taming the Bicycle"