If he'd managed to make twice as many actual songs for Hellbilly Deluxe, and half as much filler, that might be higher. But it's an EP with a load of crap between the actual songs.
And HD2 just has too many bad songs. Educated Horses has none, and is also easily his most creative and varied album, and The Sinister Urge is basically what Hellbilly Deluxe should have been.
4/4 Celebrating Jon Lord