Could you add support for Secretas & Frozeta mod? (https://mods.factorio.com/mod/secretas)
it adds Speed module 4, and Quality module 4 at the same 3% bonus this mod adds to quality module 3

Hmm I guess I could make mod change a 3% module into 4% module or something so that two module tiers don't end up identical.

i gave you some bad info... my bad.
they name spaced the quality module to be "quality-module-4-S"

adding this

    --secretas
    ["quality-module-4-S"] = settings.startup["eq-qual-4-value"].value / 10.0,

into the mapping solves the issue, thank you for your time :)

Added it to mod, thanks for the details.