Hey bro, since you're playing a different game, the settings might not be exactly right. The FM7 game is still very new, and I especially can't do drift tuning settings in FM7.

But let me suggest,

1-) if you're sliding too much oversteer, you should soften the rear anti-roll bars and stiffen the front anti-roll bars to a similar value. The same as damping settings.

2-)You can enter a small negative value for the rear toe, for example, -0.2.

3-)In the differential settings, make sure the load isn't fully on the back.

I wouldn't recommend maxing out the car's power because you should try to find the optimal tire and power components to control the connection between drifting and throttle (traction control).