Cool shape, Sam. I think the stem is a bit rough, though. The fat flare doesn't appeal to me personally, but I think it could work if it were seated against the shank face. To my eye, the stem bends too abruptly and gets too thin too fast.
I agree about the button. If you taper your button inward toward your slot I think it'll help to lessen the effect that Jessie described.
Those are my thoughts. Take them for what they're worth.
I look forward to seeing it in person soon. Pics are always tough to see the details on.