At the risk of sounding conceited, I found this challenge easy and beat it on the first attempt (after testing 3 or 4 cars for 1-2 laps each). Actually my biggest challenge was NOT falling asleep (it was late) and in two instances I lost concentration and ran off the track and lost a few seconds. Granted, I like Lago Maggiore, I'm usually fast here, and I practiced a LOT on the Lewis Hamilton Challenge in GTS, until I could easily run a Diamond lap. I know it sounds like I'm just showing off, BUT my point is (like others have mentioned here) pushing yourself on this track will improve your overall driving skills in Gr3... And my tips, for those struggling :
I used a 1 stop strategy with the WRX on RH tyres and short shifted to save fuel (50% bar, approx 7,500 rpm; or less)... Because let's face it, the WRX prefers to short shift anyway. No other Fuel Management was required... FM1 for 15 laps... (actually 16 laps I think).
Because you're keeping the revs low, the car is quite stable and the driving is relaxed (like a walk in the park... lol). However even with low revs, on the Hard tyres the WRX will overseer if you stomp on the accelerator, so I got lazy and turned on the countersteering assistance, rather than focusing on good technique... Your choice... Both ways work well.
Consistent laps around 1:57-1:59 depending on the AI interference / my loss of concentration. Worked my way up to around P4 before they start pitting on lap 10, which then put me easily in the lead and with a clear track until I pitted after finishing lap 16. B.Buthead slowly gained on me because he's on a two stop strategy, but he never caught me up (after his 2nd pit) and I still won by more than 10 seconds without needing to push hard, and including a few mistakes as mentioned already.
I'm going to run it again tonight and try to push a little harder, just to come up the Friends leaderboard... & might also buy the RX Vision to post a comparison, if anyone is interested.
Someone requested tips for the final few corners... Happy to help if still needed