Trailbraking is very important in the hairpins, the car doesn't really like to rotate through there.
Make sure you open the steering wheel when applying full throttle.

Some setup tips if you struggle with on throttle oversteer:

Stiffen front roll bar, increase rear bumpstoprange or decrease rear ride height.

For question about the setup you can DM me on Nils Naujoks - popometer.io Discord.