I run mostly Gr.3 cars and road cars with racing car engines at Sardegna. Still easy, but feels more balanced.I concur entirely about Sardenga. The track and event is far too easy (after you've run it a couple dozen times) when weighed against the incredible performance of the cars that can be used in the event, which just happen to be among best ever in racing history as well as Gran Turismo history (R92, 787, 962). It becomes auto pilot. It's why I vastly prefer Tokyo if I'm gonna simply race to grind for credits. It's always challenging (wet, narrow, strict CRB conditions), and you can run pretty much every iconic road car from the 1950s to the 2020's, so it doesn't have the same repetitive feel like Sardenga.
The problem is that the best Gr.3 car (McLaren F1) can barely reach 800 PP, but the Group C cars can be downtuned to 800 PP with lots and lots of grip.