Reflux mamas - What teat size are you using?

So my little one is currently still on number 1 (newborn) and anything faster and she vomits more, or gets frustrated as she’s used to slower flow.

We changed to medium (3-8 months ish) flow recently as she was also getting frustrated that the milk wasn’t coming out fast enough. But she’s began to vomit more.

What flow teats do you use with your little ones and how long did it take for them to get used to them (if you moved onto a faster flow)

Thanks!