Jeje, as you were kind enough to offer your setups, I thought I'd give one a go and reciprocate with some feedback. Hope that's okay.. think you said feedback was fine?
I tried your Lexus IS 300 Sport Cross '01 tune at Brands Hatch with your suspension and dif settings and my own gearbox, no oil change and standard wheels.
It felt very predictable, well balanced and good under braking if you hit your mark. A nice easy-to-handle solid tune and perfect for running consistent laps. But when going after it I would have liked a little more grip and rotation on and off the power. Some understeer was present which hurt through the faster corners which meant I couldn't push it as much as I would have liked. No late braking or turning in when still on the brakes. I had to brake early to get my line right but could trust the grip when powering out (unlike my Lexus tune which can be a bit twitchy on exit). I think a more aggressive tune is just personal taste really. I prefer my cars set up for TT style racing as it suits my style better.
So, to the lap time: she came home in 1:33.1 (after 10 laps or so of trying with tyre wear off).
I then messed around with my Lexus tune specifically for Brands Hatch and managed a 1:31.3. So there is more grip out there with a track specific tune.
A safe and solid tune Jeje