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Well, the throttle plates are not REALLY "at their stops." Somebody has monkeyed with the ones on the right, because they are easily accessible, whereas, the throttle plate stops on the left (port side) bank are inaccessible without a special tool.
You might try removing the throttle bodies and making up a "flow bench" consisting of a shop vac with appropriate reducer and seal on one side, and the synchrometer on the other. Or you could send them off to be flowed by Matt Blast at Eurometrix, or Henry Schmidt. They will come back with the linkages adjusted and marked with witness marks (paint on the shafts) so they are all pulling equally, then the fine adjustment is set with the air bleed screw. (Which technically IS a "mixture screw" insofar as it controls the air portion of the air-fuel mixture, but I know what you mean).
I also like Grady's idea of checking the cam timing.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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