Yes Rui, I'm using the track limits and no aids. I even manage to do 2:05.900 and I think I can go faster. Try to reduce suspension height and reduce the spring force, it might help. There is one thing that might be doing all the diference and it is how fast you change the gear.
A few days ago I was racing with @Jorge Alves and with the same setup I was being mutch more fast. It was very strange.... We came to the conclusion that it was related to how fast you change gears. Jorge was very smooth and never damage is gearbox while I was pushing the engine to the limits and being very demanding with the gearbox (after a long race my gearbox is all yelow\red).