Thrust adjustment

Thrust angle adjustment on BC7 SUBARU Legacy LSi US model is now undergoing, almost of it has removed but still remains a bit, probably below 1 minute angle value to plus direction. Very slight as it is, right side steering adjustment while running is required. Bad steering habit appears as a counter measure no matter how the rate of discrepancy might be only 1 minute degree. It means that the car goes left side automatically after 100m distance, in another words, the driver goes on a part of circle and he or she would adjust unconsciously the steering position to keep straight running with some subtle expectation all the time. The less steering adjustment, the better for comfortable ride if we pay attention on the fatigue after driving long. So, the diameter of the circle should be as long as possible to make the adjusting timing as less as possible. This is why I have been insisting on Zero thrust angle on the vehicle.
200 km distance on the high way running yesterday has  eliminated a tight corner braking phenomena thoroughly, that phenomena has not been brought by clutch facing surfaces wear as before but because of a lack of finishing on replaced new facing parts. Consequently, my lovely BC7 has acquired some perfect trans-axle drive train with my satisfactory. Innate rear toe adjusting constructive design is not enough to adjust and to tighten so precisely as required actually, cam adjusting mechanical construction and backlash there make it rough and half-way whoever might try to do that, so much more precise and dense adjusting mechanical designing should be applied there like that of microscope focusing construction? As a matter of fact, the adjusting constructive mechanism does not play well where so precise action is demanded as to the rate of below 1,000 micrometer order revel. In order to press ahead with doing the work under some very inadequate circumstance, external precise device should be invited like LASER pointer equipped ST, so I utilize it in the scaling and adjusting procedures, also some experience and keen sense and observation with mental concentration might be indispensable in the situation.