Spark Plug Heat ranges, what gains have you made?

[MoJo Risen]

I run a turbo car with a enhanced tune.
Boost is 16.5psi now from 14.1psi.

I have tried all variations of VP UNLEADED RACE fuel.

I find it difficult to see a performance difference in any as opposed to Costco fuel with VP octane booster.

I do have data that leans toward when I use VP C9 or MS101 AND BRACKET RACE THE CAR IS MORE CONSISTANT, EASIER TO DIAL.

I digress, my goal is to gain more from a colder plug than standard plug.

The NGK codest plug is 3 heat ranges colder than my stock plug.

I think it will be worth a tenth in my vehicle.

Thanks in advance for your input.