answer, answer, answer

I actually have a poor-quality vid of my 57" 76 run with Toad, (where I missed a blue boost) that no one has ever seen, because I haven't compressed it, and it's over 3 MB. Oh well, I suppose all you would need to know is where to shroom.

Basically, tree trick where you would normally shroom for the (Non-SC) 3-lap.
Counting the right hand bumper as the first, you go over the 2nd, and turn around the corner, get the boost to prevent a loss of speed when you drive over the cloud surface, and shroom into the beanstalk on your left. You'll have enough speed at the bumper to go over the gap, and the speed increase would last until the U-turn, where I choose to turn normally, but you could just cut the turn straight out by going through the small gap between the barrier and the beanstalk.

I hope this helps.

Andreas