Hello Victor,
I see that no one has replied, so offer my thoughts. Although improved conductivity can aid in reducing flicker, it is not usually a way of eliminating it. I have not used the products that you mention, but have tried 'Electrolube' which is a conductive oil. It has many many uses and I swear by it to improve conductivity in various places, sometimes for model railway purposes, but it will not eliminate flicker.
IMHO the only wise way is to introduce a way to store power for lights so that when running over points etc., the lights continue to burn steadily. Now, I admit that I have not yet done it (just getting back into the hobby after a 20 year break), but using a circuit that includes a button battery and pick-up from the wheels is one method, and another is to use a small capacitor. In each case some electronic circuitry is required, but I am sure that it is not very complicated and that some members here can advise you.
Dane.
