Are my flanges to big? (TMI photo)

Lexie

So I been using 27mm flanges they seem to be working but I don’t know, I keep hearing that if it’s to small or to big you won’t get as much much, when I do my automatic pump I get about 3 to 4 oz but I still feel full so I have to do manual pump till I see no drips that’s when I feel better but is it a good size or should I go smaller top photo is before pumping and bottom is after