Just my opinion, but I think your lights are set too high and the Alk/Ca are too high considering your very low nutrients.
There is a separate area on this forum that has pages upon pages of the AI Lights. Personally, I have the AI Prime HD and I will attach my settings.
Everything I read is you should really only peak your lights 3-4 hours a day. I don't know if the respiration intervals do anything, but most people have said extensive peak lightning is not good.
Additionally, take a look at this article:
http://reefinabox.com/right-alkalinity-coral-growth/