Hi Brian,
Just to test I have set my longitude east by ~ 7 degrees so sunset/rise show 30mins early, and with the daylight saving option on I’m getting good results both ends of the day (max gets to 5 at real sunset/rise). I really like the way this works 
Perhaps that minimum value could be 10? I see we’re both getting odd 16% glitches during the night, or just set solar =0 at night ?
Hey there’s actually clear sky this morning here now! be good for testing hmm ok didn’t last lol
Cheers,
-ricky