Did you go through the process of setting the default color? Or just switched the device handler?
The device handler in this thread is updated with my code. You can try using that. If it doesnt help, please send me the logs from one of the bulbs and I can try to take a look at it. I had some bulbs that didnt want to set the defaults regardless of the firmware, but I thought it was due to making some settings go bad on the bulbs during the development. And if you can, I would recommend you to update the firmware to be sure as well.