Confused on Eufy S1 Pro

Hi all!

I’ve been using the Momcozy M5 (hand me down from my sister) and recently bought the Eufy S1 Pro on Amazon prime day sale. I am only using wearables on my journey as we are combo feeding and the Spectra was killing my soul lugging it around (I tried collection cups too).

When I first bought the Eufy, all I could say was OW! It hurt so much. I guess that’s a strong suction, but I honestly started resenting pumping. I read about the legendary inserts, so now I tried that, but I pumped for 40 min at max output and am still feeling full.

I triple checked my nipple placement and everything. I get way more with my sisters hand me down M5 and am wondering if I return the Eufy and just buy a new M5?

Any help would be great as I’ve seen so many people have success with the Eufy! I do think I may have elastic nipples? Also, should I size down with the flange for Eufy? I thought I read somewhere that could help?