I don't know how much help this is, but I don't find any of my Westcomb shells to be roomy. Their fit is fairly consistent across their entire line, and I sized up compared to Patagonia (M->L). Even the "freeride cut" of the vapor fx shell is fairly trim.
i found the same thing. i had a mirage L and it was too tight through the shoulders - had to move it. i do have a kokanee hoody L bought in 2015 and it's properly sized. very nice 800 fill ltwt piece, although the hood could use an adjuster.
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