Low supply in the late morning/afternoon help?

I am an under supplier on a mission to get my supply is as much as possible! 11weeks pp and pumping 8-9 times a day.

My 7pm, 11:30pm, 3am and 6am pumps all give me 2-4oz. But in the day? 9am, 11am, 2pm, 4pm I am lucky to get an ounce? Can I bring them up by power pumping? If I got 2-4oz for every pump I’d be much closer to a just enougher!