When I arrived in Redmond January 2005 the new wing jigs had only recently been placed in the shop.  I believe that mine were the first 2 wings made on them.  While flying these past few weeks one thing has become obvious: the wings are dead-on.  With no trim the plane tracks straight ahead hands-off.  Kick the rudder and it's back on track in 2 oscillations with no loss of altitude.  Same with pitch and roll.  There's no doubt that the new jigs are great and if asymmetric twist is your problem then they should bring the bad wings back into spec.