My man this is normal Denali AWD symptoms.
I have a 2005 Denali and a 2005 4WD Tahoe.
My Tahoe turns on a dime, the Denali takes a 3 point turn.
My Tahoe drives like my Denali when I put it in 4WD, because the Denali is always in 4WD.
So when the Denali makes a turn it plows through and will tear off tread on the outer corners.
I bought a new set of tires for mine and I don't think I will rotate them at all because the front tires wear out so much faster.
My son n law complained about this same thing and once I bought one I had the exact same experience and got an appreciation for what he mentioned.
@latvius, have you ever considered a lil bit of negative camber on your front wheels?
My experience has shown that:
as much positive caster as reasonably possible
a barely visible amount of toe IN
a barely visible amount of negative camber
significantly improves steering response.
As for tire wear, you may need to rotate the tires MORE often (pain in the arse, I know).