Yep, just did this test and it's almost identical to yours... maybe a little less pronounced, but definitely twisted.
Guess I'll get in touch with the guys at Lakland and get the ball rolling.
The slight twist may be in-fact due to the amount of tension of the heavier strings on the bass side as opposed to the treble side of the head when pulled across the nut?
Just a thought. Try raising the saddles slightly.
Correction - I mis-spoke earlier with loosening the trussrod. <-- That would affect the lower register frets near the nut.
