thanks for the reply
I did also try that, I added that code at the end of the part config, it was after a }} but I'm not sure if that affects anything. I saw on the github that the bonus seems to be coded to apply to all parts that have that particular grav ring module, rather than being its own bonus that can be applied to a part.
It usually shows the bonus in a tip when you open the part in VAB, not seeing any new module effects. The part is the Sin Phi 30m centrifuge, it does have low/high quality for maintenance but that could be procedurally added.
I think i'm following the basics but still no new effects showing up on the part