If my memory serves me rightly, I used this car as well... you need to fit harder tyres so that you either do not need to stop at all, or only need to stop as many times as your fastest competitor. Of course, the harder the tyre, the slower you will be at first (as the tyre warms up). For a 15 lap race, for example, ideally you want some tyres that will hit the 'sweet spot' around lap 6 and start to fade at 7 or 8 (pitting on lap 8) - you don't want them to stay blue (cold) for too long (i.e. they should be green by somewhere on lap 2) and you don't want them to wear out too early (pit when they are dark yellow/light orange, pref. as close to the middle of the race as possible)... also, watch which tyres go off first. If the rear tyres go off much quicker, put a harder compound on the rears, and softer tyres on the fronts. That way you'll get a nice balance and the optimal grip...
In the Driving Aids, take off ASM completely and reduce TCS to atleast 2 (most people would just use 0, but I find this makes for too much wheelspin at the start of the race) - 2 gives you enough but not too much.
Also, keep tweaking the settings - a good tip is to use the different 'set-ups' available - you can have three different set-ups for your car. Keep set-up 1 default, make set-up 2 your 'experimental' mode, and use set-up 3 as your ideal mode (i.e. keep all the good changes that seem to give you the best results)... I can't remember any specific changes I made to this specific car, but that was the way that I found my ideal set-up (I always use max or near-max downforce and near min ride height...)
You will have to do the first race a few times to get an idea of the kind of pace you need to be at in order to win, and specifically to see if and when your opponents pit. If they don't pit, you need to establish a gap of about 20-25 secs per pitstop you need to make, which as I said already, should only be once in a 15 lap race.
Good luck...👍