We make some simple model to test the math.

1, 2 – Servo S9G

3,4 – Servo brackets

5,6 – Low levers of FLM

7,8 – Upper levers of FLM

9 - Central hinge with pusher.

10,11 – Servo brackets holders

And the example of upper lever with Q=20, number 7 right up.

And the schematics for two servo and two potentiometers. See the program code for Arduino in "files".