I was surprised at how many laps I could run past the tires prime, and that caught me out... At lap 11, I still had a lot of tire showing on the indicators so I changed strategy to a 1 stop race... big mistake. I didn't realize that the 4 following laps would lose nearly an entire pit stop worth of time and then force me to lose similar time again on the second stint toward the end. With softs, you may lose a little extra time by lengthening a stint, but it normally turns out better/even, with Hards it wasn't even close. I think it has more to do with how many slow laps the hards can turn before they are useless versus the number a soft tire can turn (significantly less).