I had understood how to take the T3-T4 section watching your WR but that is one of the point I still don't masterize too much. Once in a while the car is well enough to allow me to keep full throttle on but it is still very rare.
To stay in the subject, you can try WR's howner set when you watch their replay. During a replay you press SEC key, in the menu there an option saying "try to drive" or something like that. But there, you realise you're not ready to drive with this kind of set...
The biohazard set is ok, but under steer a lot (just increase the downforce)
And keep this advice in mind :
in a turn the best thing to do is "Slow in, fast out". Don't be affraid to brake sooner if it helps you to accelarate sooner after the appex. It's very important in T1 of BL1 (if you want to approach split time like 23"50)...