Trying to build up milk supply with Haaka

Hi! My baby is 5 weeks and I just started using haaka and I usually get way less than 1oz per feeding (holding it on 10-20min). What’s a normal amount? On YouTube I saw women getting 2oz easy, sometimes even 5oz+. I believe my suction is good, it’s so tight and the boob is totally squished in there deep.

I’m dealing with a baby who’s always hungry and I’m trying to build up my milk supply. Has anyone done this using a Haaka?

I’m currently feeding the baby on one side for 20-30min and using Haaka on another. Then I’ll swap breasts for another 10min. So far I’m not seeing much progress and the baby still feels hungry after (I give him the milk I collected after each feeding)

Anyone has had successful experience building milk supply with Haaka?