I`m having fun levelling up 60-70`s daily drivers in free play. (hotter cars later)
My basic setup:
Advanced freeplay, racelenght: custom (10 laps?), sports difficulty, max ai drivers, max difficulty, ascending PI grid-order*, weather: variable, car division: any(!!) car class: open or your pick, year min: 1960*, year max: 1980*, weight min: 1500lbs (to filter out 60`s F1 cars),
Open Setting, then "gameplay & hud":
Mini leaderboard: ON, show time.
Names over cars solo: position
Drivatar designs: ON
Race activity feed: ON
Basic tuning: soft(est possible?) springs, start with moderate/low ARB, damper bound +/-5, rebound 9-11+. Play with tyrepressure & ballast to balance the car, differential brake, RWD; start at 55%, tighten up until it starts to understeer. FWD; 30-35%.
Some cars might gain a lot just by changing the gear-ratio, testdrive! Have fun!
* your pick..