That basically sounds like my settings. I am in the process of bringing my whites up but only change 1% a week, so it takes time. Not too sure how high I will go.
I have experimented with mine a bit and this is how it is at the moment.
P1 6:30am
W 0% B 1%
P2 12:00pm
W 67% B 100%
P3 3pm
W 67% B 100%
P4 8:30pm
W 5% B 45%
P5 10pm
W 0% B 20%
P6 11:30pm
W 0% B 0%
I keep 3 hours at peak from midday. My tank is mixed, but mainly LPS dominant. I do have some zoathinds and GSP, as well as varying montipora, from setosa to digi.
The main thing I learned was to change slowly. I was doing 1% a day and it's too much change in too short time period in my opinion and I noticed a negative effect on my coral.
Not sure about your brown algae issue, post a picture and what you percentages are at the moment and I'll let you know what I think.
This was on a mixed tank from sps/zoas/some lps. Standard 29 gallon tank. As I was getting more into sps I bumped the % of each channel by 20% over a months time. Be careful though, these lights will fry your coral if you go up too fast.