Minimum side clearance on slicks?

I think yes under acceleration they get taller and skinnier but I believe what the Builder or his friend was saying is when you drop off the throttle they sponge down and it gets a little sideways now they're fat soft and stretching sideways in the wall if it gets left or right out of control a little bit? Now this is just what I'm thinking in my head.
I do see what you are saying, but will they get any 'fatter' during deceleration than they are when static? During deceleration, there is more weight on the nose.