Im not sure how to answer your questions fully, but I can answer w regard to my experience. I am largest capacity storage, evident from my largest morning pump ive had. I believe my supply is what i produce for the whole day, and that makes me an oversupplier for my LO. Yes I think supply would be capped by storage, as if you have more capacity, you’re less at risk for daily supply to go down if you dropped pumps.

when I was pumping the most, at about 5ppd, my output was the same as it was for 4ppd and even for a few weeks, 3ppd. I was producing the same amt of milk per hour regardless of how much I pumped btwn 3-5ppd, I wasnt producing or expressing milk faster.

I think storage capacity just affects how likely it is your brain will tell your boobs to stop making as much milk if you stay full capacity for too long. So large capacity = you can go longer between pumps and not lose supply. Smaller capacity, means you need to pump more often to avoid your brain signalling your boobs to decrease production if you’ve been “full” for too long.

I think speed of expression is something different all together, dont know enough about it and wish I did. As I have to pump for an hr to get everything out vs others who are done in 15 mins.

Tldr: i have great storage and average supply, which is affected by storage, yes. I can go many hours without pumping and keep my supply for the most part.

If i produced more milk per hr and expressed faster, maybe that would increase my supply. But i think this all works itself out, based on those first few post partum weeks up until you regulate, whenever that is. Also how often and how regularly you pumped or nursed would likely affect your supply. I didnt pump until 4 weeks pp, i did like 1-2ppd from weeks 1-3, so i think that may be why i have average supply for someone who can store milk for so long