The only time I really tested the effects of tyre pressure was in 2012 at the Estoril track.
Of course tracks aren't roads, their smooth surface allow us more inflated tyres and having a better "flank" rigidity (not sure of the right words, hope this makes sense) will prevent exactly what you described, a sudden loss of rear grip followed by a 180º
2.0 made me have a few moments when I tried to find the limit of the rear tyres adhesion in sudden, sharp cornering. The fronts would go wherever I wanted, but the rears had some problems to follow. In sustained long cornering the car kept some indecision between under and oversteer, making it a bit tricky to get a good exit speed for the main straight (Estoril has what you might call a "inverted Parabolica" as last corner, meaning its still a long right corner, but closes slightly at the end, while the Monza one opens at the end)
2.2 was much better compared to 2.0. In sharp cornering the rear tyres didn't complain and the car never got (or menaced to get) out of shape. In sustained cornering, as I tried to go faster each time, the limit of the car became quite clearly the front tyres, with the fronts showing signs of reaching the breaking point long before I had any worry with what I felt at the rear of the car, always stable.
I got to say by the end of these tests the tyres looked like they had begun to melt. Thankfully they didn't
The TOYO tyres are different beasts though and their rubber is so grippy that your greatest concern is the the lateral forces in cornering don't affect their shape and contact patch. SO yuo need to up the pressure to a point where you can really throw the car into the corners with full confidence that it'll hold grip, driving it almost like a go-kart.
I recorded a video of the front wheel work during a climb, that's a TOYO R888 pressured up to 2.3 (when cold) doing what it was designed for.
