I've never gone to a track..
What I do in the public road is using the left side of the right foot to brake, and the right side of the right foot to blip the throttle...since it is almost impossible to press the brake pedal hard enough to heel and toe (they've to be the same height for you to do it probably)..
and it isn't comfortable to keep your right foot off the ground to brake everyday..coz for you to heel and toe probably, you should've your right foot off the ground when braking so that it is more flexible for you to turn your foot and blip the throttle...you can do that on the track though coz you need lots of braking... I've replay and replay, slow motion and slow motion to watch how those Best Motoring people did it, they never brake the car with their heel on the ground, they just leave them in the air... which I found very hard to do on public road...
I spent a lot of time to investigate how to heel toe probably
