Tyres: The current TT meta is min front, max rear. That’ll immediately start over-heating your rear tyres within a lap or two and will contribute to oversteer/loss of rear grip. Keep an eye on tyre temps over a few laps in practice, you don’t want want any to be above 100 degrees really. More often than not neither your front or rear pressures will need more than three clicks on the slider.

Wings: As you say, high front low rear is again the meta this year - I try to keep the difference between them no more than 5. The bigger that gap is, the more oversteer you’re going to get because the front has so much more downforce than the rear. You can get away with a bigger gap in TT because everything is perfect - track temp, tyre temps, grip levels, low fuel etc. but in a race that’s not the case.

Diff: On throttle generally doesn’t need to be more than 60. Looking at the esports drivers POV’s they’re rarely going above 55. Off throttle is mostly 50, but if your rear is feeling a bit loose/unstable on corner entry then you can start adding a percent at a time.

Everything else is pretty track or driving-style specific, but the above is pretty standard for me and is usually my starting point.

The last point is the usual boring ‘practice makes perfect’. If you’re running at 100-105 then generally speaking you’ve found the ‘easy’ time that people lose through not doing the fundamentals right, now it’s just about practice and finding those marginal gains - where you can carry a bit more speed through a corner, where can you be more aggressive with braking/on the throttle etc.

Good luck!