Hi 
Sorry for such a late reply here, thanks for bringing this up! The button coloring is certainly buggy behavior, it seems that there's a threshold at which primary color overrides the accent color for buttons. Can you try setting your primary text color to #030303 or higher in the theme you posted?
Having table highlighting be accessible in themes seems like a good thing to post in the feature request section for visibility. You might also want to take a look at adding some custom CSS to your apps in the meantime! There are a couple of posts (like this one and this one) around the forums on how to add certain styles to your apps, using custom CSS isn't as maintainable as themes, and were working to put more options in the platform for you, but it often provides nice workarounds 