Really like the new settings, much better. I do have some questions, though:

1. Eco Mode setting is confusing. The subtext says "Reduce CPU/GPU usage on battery" but then the options seem to suggest otherwise. There's one simply to enable eco mode and another to auto-enable when on battery, but if it only applies when on battery, these both seemingly do the same thing. So either the description is wrong, and the first enable option enables eco mode whether on battery or not, or it only enables while on battery, in which case, it doesn't seem two enable options are necessary and, in fact, it seems two would cause problems.
2. In app rules, the +/- icons on the target volume bar should be buttons to allow easier fine adjustments. Perhaps it should also make it so scrolling when hovering over the volume bar adjusts it by 1% increments rather than scrolling the settings page, similar to how scrolling works on the flyout.
3. Focus lost - maybe this is getting more fine-grained than necessary, but if applying this to only apps set in app rules, it seems each app should be able to be individually adjusted, i.e. show the background volume and fade duration settings in app rules as well and use them, if set, to override the default set in the main settings, otherwise, if not set there, use the default.
4. As shown in the image below, the diagnostics info shows peak values lower than the current on all values it's shown for. Also, what is the "User" value especially, and also the GDI value (I know it stands for Graphics Device Interface, but no idea what it actually means in the context of BT)?