Why alter the original coarse? The DOT offered to leave it intact for race use. This must raise the question 'why are the ACU getting involved? as the way I see it although they issue the coarse permit if nothing changes then there is no reason not to license the existing circuit.
With talk of changes to Hilberry,apparently now an accident blackspot due to greater speeds through Brandish, comparisons of lap times through the ages are becoming meaningless. Just an opinion