What sort of boosters have you got? My baby is only 8 months so probably not peeing any where near as much as your little one, but she does get through nappies quickly. The most absorbent boosters I've found have been hemp ones and I'm about to get some thirsties hemp prefolds which I hope to use to boost at night. I do use bamboo as well but always add in a hemp booster as the last layer (furthest from bum iykwim).
I tried zorb recently too which I heard was great and even though it worked I still think the hemp lasts longer.
I realise though that this might not be very helpful without buying more prefolds/ boosters