We must have two completely different jackets, even though they are the same model.The premium does have the nicer cuff details and curved yoke.
I cannot layer underneath my Premium because the cutting is like a shirt. So it's a shacket and not quite a jacket.
I think it's best if you talk to Aero when they get back and see what they recommend. They know their jackets best. FWIW, I did inquire about getting a shearling lined PHwyman and they talked me out of it. And now I've got a Highwayman/Sheene hybrid in the works.
Here is my Premium Highwayman, when I first got it I was baffled by the size and the creases it made all around. And I experimented with many different things. Now I just come to accept that it is a shacket that fits small but measures big. My jacket is also in the Pinnacle leather so it's deerskin soft, completely opposite of CXL. In CXL I won't be able to wear it in the same size I would want to go up at least one. And this is why I would almost want to suggest you to get the next size up. But talk to Aero. They'd know best.
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My many experiments with clips...
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With my two PHWM I can definitely wear a thicker sweater underneath and with the cordovan a puffer vest.
Or maybe we have a different perception of "too tight"