No problem. Here's my 2 cents. Just remember you get what you pay for.
Well I tried your setup Goix, and didn't have much luck with it, so I kinda started over and came up with this.....
non-hp
oil-50
s3 tires-6800
wt. reduction1-1200
twin clutch-2700
race flywheel-1050
1.5 LSD-4500
Total non-hp-16,350
hp
na tuning stage 1- 4900
grand total 21,250 with 750 leftover
If I had this to do over, I would forego the weight reduction and put the chip in for more horsepower. But I don't want to get another car, so this is good enough.
I agree with almost everything you did on your setup goix, but felt it important to get the na tuning, which brings power up to 365hp. Going from a triple clutch down to a twin clutch made no difference. If you were maxing out the horsepower, then I would say definitely you need the triple clutch for holding revs.
The race flywheel is what makes the difference on this car IMO.
I also don't agree on your choice not to use TCS or ASM. I know this flies in the face of conventional wisdom, but I don't subscribe to the arrogance that aids are used as a crutch by slow racers. Rather I contend that aids are but another tool to be used or not, in setup. If it makes you faster, use the damn things! Faster is the point, right?

Actually what the aids do in this case, is allow you to drive the fast and proper line thru the course. You can't drive fast if you're fighting the handling all the time.
Anyway to help contend with the wheelspin, I've got TCS set at 1. To help the car pivot better, and get rid of the godawful push, I've got ASM understeer set at 5. As long as you drive a proper line, and pay attention to your braking points, the aids are not intrusive IMO.
So anyway, here's the splits I got with this setup.
T1: 21.450
T2: 1'04.817
Not too bad, but you can do better than this! I didn't have time to run very many laps, and I think that another .5-.7 reduction is within reach. Maybe I'll submit this one, it's clean anyway.
Good luck Goixoye!