Connor
Hello,
If I remember correctly, your team will be Level 10 for Quick race events (they have Level 10 DRS and KERS). AFAIK, drivers are given their ideal setup for QRs.
Using this info, QR could be used for 'apples to apples' comparisons, but bear in mind that tyre wear and fuel use rates may be different in QR than league races due to the differing race lengths, and different car designs.
Yes, QR is set at lvl 10 for everyone and (if I'm interpreting it correctly) doesn't take into account different setups thus provides an even playing field where only PL, tire temp, and DRS affect the race. Tire wear and fuel use I have a handle on but car setup (engine, tires, fuel) per different track is my achilles heal and the area I can improve.