Precise adjustment?

Precise rear toe adjustment to change the total toe direction, "Thrust Angle", was also performed last night seeking the critical Zero degree establishment. The more critical phase I might come into, the more precision is required in the adjustment procedure. The problem of elusive variation on data sampling could not solved until the pressure on touching surfaces between the scaling point and the device should be kept evenly at each measurements. 1 kg iron rectangular solid is put aside touching beside the scaling device, I make it a rule to keep the experiment condition same at any time I do. This is the same as an electric terminal's pressure.
BC7 SUBARU Legacy LSi US model goes straight without any finger assist holding on a flat ground plane, but some residual internal stress remains in rubber material construction,in bushes also in tire treads, the evaluation of true performance should be done after 200 km distance breaking in actual running. The physical property of rubber materials is always a awkward presence, causing hysteresis and viscoelasticity.
Repeated adjustment destroyed tightening 17 mm nut, the work is done under severe condition without lifting machinery and the accessing direction is strict against my will, so this kind of error happens occasionally, as a matter of fact, it was replaced into genuine new parts.
The measure being done on BC7 now is mealy a symptomatic treatment, the result would be clear that the fundamentally accurate geometric axle construction should be establish before we proceed to wheel alignment adjustment, if we desire form a heart a perfect alignment that the steering reaction and habit does not change at any speed ranges, this is my conclusive hypothesis now.  It's a fun for me if some unknown result was the same as my predictive and if not, my curiosity is amplified more and more.