It's very tricky, I'm about the same rating as you and managed a 1:25.7 in free practice, which is 198th in EMEA right now, so that's good by my standards. But I really struggle to do it consistently, I find the lack of reference points around the track mean I can't nail down every action to the mm where I can accurately repeat it every time, and what I've noticed is that incredibly small differences in how you take some bits can make a huge time difference. I think it's a track that would be much easier on a 32:9 screen or with VR, as the place you need to see to judge the next action is so often off the screen.
My race was a bit disappointing in that I ended up in 2nd mid race, and clearly had far better pace than the first place driver, closing up a 1.5 second gap in not much time. But once behind them, they were a moving road block. Painfully slow in all the places where I couldn't get past them, but I just wasn't quite gaining enough down the straights to get half a car of overlap before the turn in at the end. So people behind caught up and we ended up with a 5 car logjam behind painfully slow driver (PSD) in 1st. I got mugged from behind due to having to back off behind PSD and finished 5th, while PSD won. Staggeringly slow overall race time, quite bizarre, really. But 941 pts is my 4th best Nations Cup points, and I gained 900 DR, just under 1500 short of A rating now.