Solex 34 PICT3 mixture control

Realized I this morning that I have been influenced too much by the description in some article about the adjustment of Solex 34 PICT 3 carburetor, especially on the adjustment on the mixture control screw position. 2 plus 1/2 opened angular position from the closed terminal point is the opinion to be rely on, and slightly opened would be favorable setting so written. I have been some doubt about the opinion with suspiｃion, because the fuel consumption amount is too much for 1600 cc motor.
So, attempted I this morning some experiment to seek the suitable angular position of fuel mixture adjustment screw(smaller one on 34PICT3) ignoring all the existing concept, just paying attention to set it at the most stable position.
1 plus 5/8 opened position from tightening is acceptable as a matter of fact, the idling sound became stable and also variation disappeared, in addition the smell of exhaust gas changed with no irritating stimulus smoke.
As I have an experience on WEBER side druft 40 DCOM carburetor set in TALBOT PEGEOT 205 Rallye by the manufacturer, single carburetor adjustment is not so difficult task for me, just the key to it is detecting the mixture now is rich or lean at idling speed!.
Deeper consideration about this phenomena led me a conclusion that the former user of the carburetor must have closed the screw with some violently destructive torque power and the needle hole must have been widened with distortion.
This is why the adjusting & setting position of the mixture control valve screw closure point had been moved at more closed position, am I right?
Align the surrounding condition is the first, otherwise, the conclusion would be changed in Scientific field.