VW1302 Thrust adjusted

The thrust angle was adjusted to the nearest condition of zero utilizing DIY special tool that has a LASER pointer in the level body for the checking of horizontal wheel inclination and 1719,75 mm radius pendulum device for doing vertical wheel inclination promptly. As a consequence arising along with IRS arm bushes replacement performed the other day, thrust angle adjustment is one of an indispensable procedure for me. The angle rate value of discrepancy before that was plus 2,37 minutes angle value that is acceptable value referring with European Traffic Safety Standard plus minus 10 minutes.
In order to establish "Zero Thrust" condition in Air-cooled VW 1302 Super Beetle, very special technique was required, because just loosening the axle bolt connecting trailing arm and hub bearing case loses rear body height in a few centimeter, so the supporting point should be set not on the shock absorber portion but on the tip end of the arm avoiding assembling error. Though I have been imagining that some unstable steering reaction such as wondering on a rut road should be brought by too much applied compliance especially to horizontal direction, it was proved after the adjustment that my idea was not to the point.
Basically fluffy as the 1302 genuine suspension and axle construction is, this is not the reason for unstable wondering at all, it goes straight in a great peace like an arrow flies after obtaining "Zero Thrust" condition. However hard I might try to find disadvantage to do like this, no argument occurs in my mind, a rolling frictional resistance and slip angle might be kept in the minimum conditions leading to compensating fuel consumption as a matter of fact?