TL;DR
Currently when you use quality ingredients for fluid recipes they have the same output.But fluids don't have quality, so instead boost productivity depending on quality input.
What?
Add a in-build productivity boost to fluid recipes with quality ingredients.I don't know, so Legendary lands on 200% or so. Needs testing.
This can either be done via the a scaled recipe or the productivity bonus.
Why?
It feels wasteful to use quality products in fluids, this should remediate the feeling.This also adds the quality mechanic benefits to fluids indirectly.