Breast feeding and Formula feeding

So I had found out at 2 weeks my son lost 1 whole oz since I had left the hospital even though I though I had a good milk supply going. We had been supplementing in and after the hospital do to low colostrum and his hunger but once my milk came in around day 4/5 I had about 3 oz or so when I pumped and I would supplement about 5-15ml during those two weeks I'd offer breast then top up. But found out he still lost weight. So fast forward to now my son will be 6 weeks come Wednesday, I am still only producing less then 3 oz of breast milk... And I top up with 3 oz of formula. I am also taking Domparidone to increase. Anyone been in my situation and able to increase supply? We feed every 3 hours, I drink a ton of water plus Gatorade and I eat well. Anyone got any advice?