I changed my software to give 5 settings as you adjust the pot.

1) 22.97 %
2) 42.01 %
3) 56.96 %
4) 74.04 %
5) 92.01 %

FYI:
My micro has a 10 bit resolution on setting PWM. So the PWM is divided up into 1024 steps from 0 to 100 %. Not that you need that accuracy in this application. Those values remain at very accurate values since it's all based of the micro clock.