i have a cream caramel in its 4th week of flower but unlike yours mine is not an auto. every auto ive done in the past ive always had best results with starting @ 20hrs then halfway thru flowering i switch it down to 18 hrs. btw the cream caramel has a very unique very very sweet smell. it really does smell like caramel/candy.
I am currently growing cream caramel, on day 60. I started on 20/4, worked my way to 19/5, and am now on 18/6. It has helped a lot to keep them from continuing to veg and go in to full force flower.