Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There have been some issues with the lower control arm bushings. The bulletin states to go through the diagnostic procedure with elimination, (which you have done mostly)
Here is what it states.
NUMBER: 02-001-07 REV. A
DATE: March 31, 2007
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 02-001-07, DATED JANUARY 20, 2007, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE A CHANGE TO A LABOR OPERATION NUMBER.
The customer when braking may experience a vehicle drift to one side and/or a vehicle body shudder. This condition may be more noticeable when brakes are applied at speeds of 88 km/h (55 mph). The vehicle body shudder may exhibit itself as: steering wheel shake, brake pedal pulsation, or seat or floor vibration.