No issues at all at high speed, directional stability is superb and on par with other supercars ( I can compare to Ferrari, Mclaren, Corvette). The car has just a tendency to understeer in hard driven corners. One night I had a Huracan Spyder in front of me. He moved to the right lane as he could not leave the Lotus behind till about 250kmh. I dont think the 311 has a disadvantage though 😆. I noticed that the car starts to shake at about 260-270kmh when the driving surface is not perfect clean. Small bumps and the car will start to splutter. The optional öhlins suspension has still the factory setup, which I think is a good setup for street and occasional racing. I dont know if we can soften it a bit for street use..otherwise it is not bad adjusted from factory.
I heard of that front splitter issue...I did not have it so far but I was just lucky as my number plate nearly got lost at high speed so that I had to fix it before it got completely lost.
Do you have some pictures of that broken splitter?