Ah, just what i tought you meant..
But i also thought that it might at worst be something more sophisticated...
But i did not recall the name...
Yes, they tried to get just a little bit more downforce in curves and balance it to not get to much on the straights to reduce top speed.
It was adjusted with 10th of inches.
Just to get it fine tuned..and get the most of it..
Some sort were tried on all versions, sort of.
Even canard fins at front of different shapes..on all versions.
And even more places...
Just the first trembling steps, to what is now know as downforce...today..
A lot happened back then...
At least at rear it proved successful..
Front were changed forth and to..so i wonder..
How it really turned out in the long run..