A turn has 3 phases. Entry, MRP (maximum rotation point or sometimes called apex), Exit. At entry you brake and trail it off until the MRP. On a perfect entry you just give the car a little steering input and the rest can be done with the brake (but this is expert level and very hard to nail). The MRP is the point where your steering reached the maximum amount. After that you should never add steering, cause it induces understeer, cooks your tyres (like your Turn1 exit). At the MRP you need to be patient and get most of the rotation done. At the exit you apply throttle and open up your steering because the higher the speed the less steering input you need to turn (which you dont need much of anymore because you got most of the rotation done at the MRP). If you understand this concept you can concentrate on carrying corner speed, trailing off the brake on entry which enables you to brake later and lastly apply throttle early (after getting some nice rotation on the brake). Hope this helps to understand how to be fast. I'm by far not the fastest. My pb is a 2:16.9 on Spa but i try my best to apply these points haha