I think the 600PP need Sport hard on tokyo. Medium = too much grip and low top speed.This car and your tunes is so good!
On Tokyo Expressway WTC600 use fuel map 1, pit at lap 6 or 7. It's rock solid steady and superfast in the turning parts of track.
On LeMans WTC700 I used fuel map 4, pit at lap 2 or 3 depending on when it starts raining, and pit again on lap 5 or 6. It's superfast all over track!
The 700PP is ok on Le Mans , just need to remember that the car don't like full braling power during a turn. Just when you place the car Remembering this point , it's a perfect car there. Almost "easy" to overtake AI under heavy rain. Have a fun drive.