That is reassuring
I am of a mind that I prefer addressing the problem VS patching it.
Your problem can be caused by:
- A underrated power supply
- An underrated tether
The more you use your thrusters the more power it needs.
BR specs say their thrusters has maximum power of 350 Watts at 15V. Lets say 325 Watts at 14V.
If you are using all 6 at the same time, you will require 1950 Watts + whatever your control system, cameras etc needs.
Most power supplies nowadays have shunt circuits, so if you are asking it too much current, the voltage will drop to prevent damage.
If this is what is happening, then you will need to limit your thrusters to 50% because the shunt circuit will overheat your power supply. Furthermore, you are not getting more power out of your thrusters as the voltage is dropping anyway.
The more current goes through your tether, the bigger the voltage drop. If this is affecting so much that it drops your 14V supply enough to cause a failure in comms, you risk having a tether overheating and exploding.
Hard to tell exactly what your problem is without knowing anything about it but one thing is sure, patching the problem in my opinion is a mistake.
If the voltage drops, the thruster looses efficiency. You are therefore gaining nothing. Best leave it as is and operate within the limitations of your power supply / tether.
Also, adding a battery or capacitor would require you to isolate the control system from the thrusters or it would not achieve much.