I think your string toe method may differ from mine. What makes you think the rear suspension is right enough to use a reference for the front? Rear on a fwd has bushings and is usually adjustable too.
Inner edge wear is excess camber. Excess toe causes feathering across all the the tread lumps, like little ramps all facing the same direction.
Fwd sometimes have the axle center line offset forward and even if it isn't offset on this car, will toe-in with traction, eliminating all the slack in the bushings and joints.
Alignment of the rear toe parallel to the rockers, would be a good place to start if the bushings and joints are not worn too much but it sounds like too much camber on the front (tilted toward the center of the car at the top of the tire).