I'm glad I'm not the only one who does the whole permanently-alter-something-before-deciding-whether-I-should schtick.

I agree that the frame is a little thick. Part of it - and this may just be the resolution of the images - is that the radio has a nice wood grain texture, which gives a feeling of busyness to the radio. The frame doesn't quite have that same presence, so its sort of a big, thick void around the screen. I don't think you really
have to do anything. Once you get some buttons on there and get used to looking at it, it'll look natural.
Otherwise, you could try dressing up the frame a little. Decorate it with some brass box corners, or some stamping, or whatever suits your household aesthetic.
I've purchased stuff from
Chinese brass hardware in the past to decorate my hanging wine glass rack and dress up my Billy book cases. Not sure if you're quite as into the brass and wood steampunk look, though. But if you are, it's a relatively inexpensive way to dress up the frame.