If my 727 shifts too soon, and too soft, which way do I adjust?

rt440mag said
By chance did you switch your carb and/or manifold to non-standard unit as well, like a high rise maybe? I was never able to get it to shift properly when I switched mine. It changes the geometry of the bell crank and shaft movement. Finally switched to a 727 Lokar cable shift down and that solved the problem. Was less than $100 and has worked flawlessly ever since.
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Yes but the Edelbrock Performer manifold is pretty close to stock height, and the Holley carb has the correct Mopar-type lever/stud installed. So... I don't really think that is the problem. But, I did swap from Holley to AVS back to Holley, and something surely got changed.