Just wanted to make a case for the 2-stop strategy:
I went for a 2-stopper and found that it suited me just fine. I had done one long stint in testing and the times I did after lap 20 or so were not encouraging, so I decided that instead of being fodder for those that can keep their tires in better shape, I'd rather be the predator on newer tires for the better part of the race and additionally be less error-prone on old tires.
And yes, it IS true that you can run into traffic, but a) after the first pitstop you are on tires that are 20(!) laps fresher, and overtaking is really not that hard in that period of time, and b) guess what the 1-stoppers run into after their stop? The 2-stoppers. So, that equals out nicely. For me, I had gathered a gap of about 15 seconds to the leaders early on until I was able to stabilize the gap. Once I had pitted, I did run into two 1-stoppers, but was able to pass them quite quickly as they were clearly struggling with their tires. I was then able to do a string of pretty good laps and found after the 1-stoppers came in, that I had actually made up the 15 seconds I was down earlier. (Actually Owens and basse literally both came out of the pits just as I went by, and I almost made a mess of it trying to stay off to the right and squeezing by - sorry for the moment, guys!)
I was then able to stay ahead until their tires warmed up and then, of course they retook their positions. Subsequently I was just trying to keep the gap in check so as not to drop back too much before my second stop. Müle also was on 2 stops and came in 2 laps earlier (just 3 or so seconds in front of me then) which was the better decision as he was able to (virtually) widen the gap until I came in. After my stop I was 45 seconds behind the leaders, but on fresher tires. I actually did my PB then in that stint (and a couple of other laps close to it) and was steadily catching up, and if it wasn't for one stupid off that cost me 8 seconds I even could have challenged Müle for 3rd (which would have meant I would have made up 25 seconds to the leaders in that stint).
So, considering that I certainly wasn't on the same outright speed as the leaders, the 2-stop strategy certainly was the right one for me.