My pumping pattern is similar to yours, but no drop wor. Just drop abt. 25% in the first few weeks when I went back to work in month 4. Now can still pump abt.30 oz per day no direct feeding. Just keep on pumping (even when no milk comes out, pump for 10 mins loger) and be relaxed. BTW, my BB is one year old today. He drinks 100% mother's milk from birth.