Advice pls

Hi mummies im EP and feeding my lo EBM since i got out of hospital. my lo is 20days old so that's how long I've EP. im pumping every 2hrs n I've some advice to drag the hours so i don't have to pump as often. but the issue is once i hit the 3hr onward mark my breast still be engorged.. so how do i get to pump lesser or stretch the hours? does my yield play a part? I'm getting about 150 - 220ml both side in total, usually more when engorged. what do i do