Stumbled across this as I had the same issue as you Steve. Using the driver from @EdenNelson I'm able to use the White LED's which is great!
Are you able to get both the RGB LED's and White LED's to turn on at the same time using that driver?
I'm finding that I can do one or the other, but not both. The colorMode will toggle between RGB and CT and turn on the corresponding LED's on the strip.