The interceptor is used mainly to fake a fixed 75% Soc so you can use all your extra capacity without regen kicking in and limited assist etc.
If you don't have one the SOC will tick down quickly and regen will start.
The interceptor can also stop assist or regen depending on programmed voltages to protect your pack.
You would need to let me know what maximum and minimum voltages you wanted then I can compile some firmware for your pack.
Don't use pots for the BCM fooler and VPIN, used fixed value 1% tolerance resistors of the appropriate value
to get the voltage down to the working range. You will then be sure they are correctly matched.
Use a voltage divider calculator to work out what resistors you need.
Voltage Divider Calculator
Resistor 2 is 100k for the above.
Put in your source voltage, (218V) and then experiment with different values for Resistor 1.
27K for R1 gets you 171V peak with a 218V pack.