Not sure if those words have ever left their mouths, but Raptor lore dating back to 2010 is that Fox tested and tuned the shocks on mid perch but DOT regulations limit the height of the Raptor from the factory.
And then there's this...
They can't come right out and say it, but they certainly don't make it sound like a bad idea. We've been reading between the lines for almost 4 years now!
They can't give any recommendation, that means they recommend it. Wink wink, nudge nudge.
I went directly to the FOX people we know from racing bikes… think about it, why are there 3 perch settings to begin with .. certainly NOT because FOX doesn't recommend it, its a Ford thing.