Extending which cable for thc

Wiring my thc, I have to extend one direction or another as my plasma (cut60) is 10+ ft away from control box. Langmuir says you should not, but I did with the firing cable, from amazon, and it works fine. Now the voltage running through the vim box is a little different. Would it be better to extend the divided or raw wires (put vim box on control box) or extend vim output (put vim on plasma)? No difference? I’ve read others have done both but no comparisons.

extend the output going from VIM to control box.