But it is still Grüß Gott, not Grüss Gott. And still Fuß, not Fuss, and so on.
And be careful, people in the northern parts of Germany might be confused by "Grüß Gott". (It's only common in the south, and actually means "Greet God")

"In jedem Winkel der Welt verborgen ein Paradies"