Tried blipping yet?
You can brake late with this car but on long, hard brakings it requires blipping the throttle because the car has no auto-blip and thus you must match the revs when downshifting.
Then the rest is up to managing the brakes, which in my opinion is easy but can get tricky while blipping. I personally do it without clutch since I can't do heel n toe with my pedals, and not like I would succeed at it anyway. Throttle is fine, just don't use it too much or it will ultimately drain the effectiveness of the brakes.
If you won't blip you will have to begin braking earlier and be gentle, thus losing plenty of time, maybe even as much as half a second or more in one braking