Daytona Road. I always, without fail, come off at the first corner.
This used to get me quite a lot in prologue.
Think of it this way - your tires only have a certain amount of grip that can be used at any one time. it could be 100% acceleration, 100% breaking, 100% turning, or combination of two of these. for this corner, go for about 50% breaking, 50% cornering.
The technique is to break early and only use half brakes and turn after a bit of breaking. Once you have this sorted, you can learn to break fully then ease off the brakes as you start to turn the wheel.
If you have time learn with a car that you are familiar with, has good braking stability and is nicely balanced, ie no understeer/oversteer.
End of the day its all about practice

hope you get it sorted soon.
On topic, im usually good on most tracks, i would say the nurburgring but im realistically never going to learn it off by heart