I see what you mean, Scott. You should keep in mind that you're not used to the 'huge' rims around your glasses. Especially smaller frames like Gascan. Your eyes have been kinda spoiled by the M Frame lens and the larger lenssize of Juliet.
Today I wore my Rx Gascan the whole day, including lots of driving and I have no problems with the peripheral vision. But I'm used to smaller frames.
You'll see you'll get used to the Gascan, eventually. Just learn to move your head a bit more. And if you don't get used to it, there's always Ebay...