I'm trying to wean from the pump but it seems like every change I make just increases my supply. I used to pump for 30 minutes every 4 hours and I would get about 10 ounces. Since I decided to wean, I have worked my way down to pumping for 20 minutes every 5-5.5 hours but now I'm getting closer to 12 ounces each time. Any time I pump less than 20 minutes, I end up painfully engorged or with plugged ducts. Any tips to get my supply to actually go down?