twins_MTB, I am no expert since I am not to0 successful in BF. However, my supply did slowly increase over the days. It was like 5ml in the first weeks and slowly increase to about 50 eventually. So yes, I would say it helps to pump regularly, every 3 hourly and 15mins minimum each breast. initially, I would even go up to 30mins each breast when I didn't let babies latch on. If you are really persistent on BF, continue to pump 3hourly though there is nothing. Supply will definitely increase. Pumping only twice will not help.
I tot the medela electric pump is quite good? I was using the mini and find that the sunction is good enough. If you are using the PIS, it should be good enough leh.
And oh yes, drink lots of water. Have to be like 2 to 3 litres. I think that help too. And after I stop expressing, I started to take fresh milk and realise that for that initially days when I started taking milk, the dried up supply seems to come back a little. So maybe drinking milk helps as well.
Doggies mum, you can call the KKH LC to ask about eating Fenugreek for G6PD babies. I think pumping regularly does help as I did see my supply increase from 5ml to 50ml. Just that I find it too much hardwork for too little milk. In addition, sometimes when the babies fusses (in the later weeks), I need to manage them as well and thus throws me off the schedule. And also it was very tiring at night with the pumping, feeding and handling the fussy babies every hourly. I hardly had a continuous hour of sleep in the first month. So decided to stop BF.
But do perservere if you have the proper pump as BM is best for babies. It took me a month to see the increase in the supply, albeit very low. In fact, doggies mum, your supply is already very good compared to mine. Just that maybe you have increase the length each session.