Hi Jeff,
Setting the colors is quite some work, at least that's my experience. With kodi internal it was alright straight after installing but since I've been using the external grabber it took me a while to set things up the way I wanted.
I've uploaded my config so maybe you can get some examples from that. Only issue I'm having at the moment is that when using hyperion as "normal lightsource" there's a flash sometimes coming from the external grabber trying to take over. I've just now changed the frame grabber priority to 900 (had it on 800) to see if that helps.
To clarify: I'm using hyperion as ambilight with TV pictures but I also use it as normal (fixed) lightsource by sending commands with Pimatic. So when the TV is not in use it will automatically switch to fixed backlight mode. Hope that's understandable, it's a rather complex system with 2 Raspberry pi's and a lot more hardware and software haha.