Light profile is just landed in master, its not released yet, wait till the weekend, then i'll cut a release.
On the flickering thing, what I meant was, I have seen sometime kessil will flicker at low pwm value (try setting the intensity below 13, and you should notice flickering), as welll as certain pwm frequency (like if you set the rpi pwm frequency to 1500). I shipped the pi pwm based builds with a known working frequency of 100Hz, which worked for me. If its working for you, then you are all set. Just cross check the lowest pwm you can do , and set that in the ui.
What's is min and start?
Thanks