Now I'm into tuning cars with 600PP or above, I'm having big issues keeping RWD cars under control. Even when carefully applying throttle, if you have a little steering on, they often spin out, or spin out at high speed. I've tried racing tyres, LSD tuning, suspension tuning, high downforce, and some cars are just almost un-drivable. E.g. I tuned a 2015 Mustang to 700PP and just making it round a lap is an achievement, even if I de-tune it via ECU a bunch. I've seen others talk about this, but it does feel like the RWD handling is very punishing. I'm a long-time player of the GT series and this is definitely new in GT7. Anyone here got any tips?
EDIT: Should add, I've tried keeping stability control on and maybe it helps 10% but it's not a solution at all. Adding countersteering assistance kind of seems like giving up and it slows you down anyway.