Your first problem is the linkage that connects to the carb throttle stud. Until you have the end of the slot closest to the firewall up against the carb stud at idle no amount of adjustment is going to change a thing. The kickdown linkage has to start moving as soon as the carb throttle does thru the entire range of motion of the carb linkage .

It appears what you have is 2 bbl linkage connected to a 4bbl , that top piece is not the same 2bbl to 4 bbl .