I really feel you on this, finding the right flange size makes such a big difference to comfort and output. My friend actually tried the Momcozy S12 Pro which comes with different flange sizes including 28mm, and she said it was really comfortable and easy to use hands-free throughout her whole breastfeeding journey. It might be worth checking it out since it is quite popular among mums here in Singapore and you can usually find it on Shopee or Lazada.