I see them now. You sure you got your math right? 19.5/16 is 1.21875, but the ratios you're using come out to 1.1768, which is 20/17.
There's only so much you can do with a finite number of pixels mate. I'd need way bigger images to have a perfect 19.5/16 ratio. I assure you you won't notice the difference. See for example a screenshot of my OP6T interface:
Screenshot_20190731-142643.jpg
Oh, so you stretched them intentionally? I know it's not a big difference but why not just use the actual ratio instead of something else?
Here's where I'm at:
Screenshot_20190731-150421.jpg
I think I'm pretty happy with this for portrait:
Screenshot_20190731-161132.jpg
I didn't know if the .skindef file would round up to the nearest whole number of pixels. I assumed it wouldn't run with floats, which I should have tested.
Your design is nice! I never needed the volume adjustment, so I didn't bother including it in portrait. But if it becomes handy for you, then your repositioning is well done.