Had a chance late this afternoon to do some test
I tried the suspension settings, did some laps, tried different things.
After watching the video i was wondering how it could run so smoothly with such great turn-in, i had an idea why, but wanted to test first, and now i can say, SRF was used for the 5:57. Theres nothing wrong in that dont get me wrong

, but you cannot really compare it to a lap without SRF.
The car simply cannot turn-in like in the video, if you try to smoke the tires like that you will lose time, a lot of time, unless you turn on SRF. And to do 5:57 without SRF you need a serious lap with not much errors.
I had a decent lap with 0.426 gain at 3rd sector over the 6:00.318, but didnt had enought time to run a clean lap. Had a lap of 5:54 with SRF though, but there was still time to shave.