Ok, I made an update. Check it and tell me what you think. I tested it in Austria for 18 laps (25%). I went to Soft-Medium-Medium and it was quite good. The Softs lasted 4 laps and the Mediums 7 each one and the performance was really good, I think is what you were expecting because used soft/medium tyres give very good performance and not just 1 lap and then being overtaked because you can't control the car because of the wear. There's one problem so maybe what you were asking is not posible (at least for me) at all. I changed the wear-grip values of soft and medium tyres but that's not exact at all. The tyrecompound.erp is divided in 14 sections, which should match C1,C2,C3,C4,C5 (front and rear) and Inter,Wet (front and rear). C5 will always be soft and C1 hard, C2 and C4 were also moded bacause they are almost hard and almost soft respectively. Then C3 could be the 3 options. I modded too but depending on the track, you may see different results. Please, if you test the mod, try in a different circuit than Austria, just to get more info about other tracks; but Austria was quite good for me. I think no one tried 1 stop but if you go for Hard-Medium, it might be posible. (Sorry for this long answer)