Just did this before work this morning ( i know, getting up fearly for racing is weird but hey..... it's GT7! )
I tried the AMG GTR first, then the BMW M6, but to be consistent in laptimes under tire wear the RCZ is absolute dominating, i did the following.
RCZ - racing mediums
first lap was very anoying due to the fact that number 1 rockets of, so first lap with trafic was 2:06, after the second lap it gets a lot easier to get in the zone, TCS OFF!! ( with TCS on i drive 1:59/2:00, without 1:57/1:58), what i did was indeed around 8 laps TCS 0, then last 2 laps of the stint TCS1, and just make your steady laps, pit end of 10, en fuel up for 11 laps, the again TCS 0, lap 18 Tcs 1, and pit end lap 21 en fuel op for 10,
You will have to make up like 8 seconds to number one Lopez, but he is very slow cause he is on hards, i was lacking concentration a bit on the last stint, so i turned the pace down alittle ( better then spin out or so ) and drove the last 5 laps around 1:59 and still won quit easy with 8 seconds on Lopez.
So make your laps, aim for 1:58's mediums, 2 stops and kill it,
I did gold the circuit experience before this and found the whole lap quit difficult at first, found out i had to cut corners alot more then i'm used to.
( PS4 with controller )
Good luck guys!