Good call on the aventador sv! Just bought it and I used praiano's 800pp tune and it is a fun car. Eats fuel too!
The 4 stage weight reduction had me bouncing off the AI cars like a pinball for a few lap until I readjusted my driving style.
It was able to pay for itself with a run on Sardegna. That is my goal ... tune a car or two a night and test them on tracks. I was trying the concept of trail braking which led to a bad start but I was getting the hang of it and putting down consistent laps by the last 5 laps. Lots of good info in these threads.