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Sepharat Thanks for the kind words! The entire PVR system will always be the weak point of the skin, since I don't use it and it's very difficult to develop anything without seeing it at work. That being said, one PVR user has suggested some quality of life improvements for PVR and has provided me with his code, which I'm currently in the process of integrating into the skin. Nothing major, but every little bit counts. The Kodi PVR settings like the one you've mentioned are system-based, not skin-based, and they usually don't work, because the skin has a complex playback interface that Kodi can't recognise, and I don't have the skill to iron these differences out without an actual usable PVR system in place on my machine. In fact, I'm not sure I would have the skill to clean up all the accumulated code even under the best of circumstances.
Now about the widgets. I remember that the art is populated in order of preference for all types of content - posters, then icons, then genre icons (if any exist). My best guess is that your PVR delivers the captions (where available) as posters, and thus overrides the logos, I'm not sure if I can do anything about that, as far as I know, there aren't any bits of code that control the retrieval process itself. One solution might be to force all PVR widgets to use icons only... though that's sure to annoy some folks. (In case you'd like to tinker with these parameters yourself, they are in Incudes_Object.xml, line 362 onwards.) A potential solution might also be to try and define a channel group and then use that widget as an alternative, to see if the behaviour might change? Super Favourites might also have some way of crafting a PVR list that you could use as a widget in a similar way, though all these are just ideal off the top of my head, and none of them may work.
Regarding your stutter issues, I might be able to point you in the right direction. I'm also on Windows 10, have the same RX card, and have had stutter issues in the past. In my case
something would send Kodi on a fritz and the entire interface would start to stutter. Periodically, if I would peer at the screen, I could actually see it gently flicker for some reason! I believe it is a general case of AMD being crappy: buggy drivers, poor FreeSync implementation (at least with my monitor) and fullscreen settings. Currently, I'm running ancient drivers from last year, have turned FreeSunc off completely, and am running Kodi in "fullscreen window". A combination of these steps might work for you. For what it's worth, I'm currently on Radeon 18.9.3. I've never been ale to get to the bottom of what causes the frizzing out, but the official skin is much better coded, so that's why it works better.