How many weeks pp are you? I used to have an oversupply too (about 9-10oz/pump from both boobs) i would say try to stretch your pumping session or use a cold compress when you’re engorged. At least that reduces my supply (now i only get 6-7oz/pump from both)
try white cabbage leaves, preferably cold for when you feel engorged just pop them in ur bra replace when u feel like u need to, sounds stupid but it works, also only pump for 5 minutes or until you are no longer engorged tbh its better to hand express. Try Extending the hours in between your pumping so if thats every 3 hours now, try extending it to 3.5hr then 4hrs next day.
The pumping isn't going to help you reduce your supply. It's going to increase it. Bf is supply and demand. The more that's taken, the more you'll make. How old is bub?
I’m struggling to get supply so be grateful that you’re getting this. How about you express?