Yeah, turn 3 and 4 are really tough on worn tires, but you can work around a bit by taking a little more speed into turn 3. This makes you go a higher betwenn 3 and 4 and you can go off the turn with less steering force, so that the you won't get loose that easy when hitting the gas. At least that's the way I worked around during my last league race there, but maybe it's better to fix it via the setup. But on the other hand, running a tight setup around Darlington can make you loose time and quite much rubber of the RF, making you even tighter ...

Just some thoughts, didn't do a lap there for month ...

EDIT: Great, we have a race here in 4 or 5 weeks, I'll give your setup a try for sure, they are really good, thanks for sharing.