I think I can simplify this a bit
When you select a complication Slot
say you pick a circle slot complication
there are several slot types
deselect all but the Ranged Value
Now for your ranged value options There are 6 layout and you can set the one you wish for default — but that may not be supported
So
Test the default one on your watch if it works you are good to go (unless you are publishing it)
If so
set the color for all 6 of them individually select one do the options set another and so on
Ron
Samsung Developer Relations