Ford purposely set up the throttle linkage/cable like that. What you guys aren't thinking about is that when your motor is running and you are out on the road and you stand on the loud pedal, the motor will torque over to the passenger side. This places additional tension on the throttle cable. Just because you can stand on the gas pedal when the car is parked without the motor running and the throttle linkage/bell crank doesn't hit the stop, doesn't mean that when you get on it on the street that the blade isn't fully opening. Ford knows this and intelligently engineered the throttle cable to be slightly loose. It's not wise to "falsely" increase" the tension.
The throttle blade is slightly elliptical, not round, it is not made to go perfectly flat. The throttle stop on the factory throttle body stops the blade right around 87°. The throttle stop on a linkage like the Acccufab is specifically engineered to open the blade precisely 88° as per their technical info in their literature I have. The reason for this is because the throttle blade is not supposed to be perfectly flat. If you look closely, there is a hump over the linkage shaft that runs through the middle of the throttle blade. Keeping the blade 1-3° from going flat. This optimizes the air flow (aerodynamics) over this “hump.”
Additionally the PCM begins to switch to WOT tables after an 80% throttle angle and significant load, and even if you manage to open the throttle blade slightly more (which is highly unlikely under operating conditions) you will not gain any aerodynamic advantage whatsoever, you will actually lose some aerodynamic advantage over the throttle blade. So with these things in mind, this mod sounds like it may not be productive, and in fact counterproductive.