Help need suggestions & advice

it's not the return spring. I put a brand new return spring down at the transmission and at the carburetor and they are soft return springs. I had a stiff return spring at the carburetor with my first edelbrock and I bought two brand new ones that were a lot softer to put at the carburetor and at the transmission.
I have covered all areas when it comes to this issue. New return springs, new accelerator cable, new throttle valve cable new throttle cable bracket. All I can think of is that the tension from the throttle valve cable going to the transmission is just too much for the edelbrock's aluminum structure to handle.
That's why I keep asking, is there anything on the transmission I can look at or lossen up to make the throttle valve cable not as hard for the carburetor to operate?