Damping may not be beneficial at all. After you set up your table and cartridge with no fluid in the well, add only 1 drop of the oil at a time....then listen. If the sound becomes cleaner, clearer, with more depth and air, add another drop, etc. When the sound becomes poorer, remove a bit of the oil with a Q-tip, and listen again. This adjustment takes time and you very well might be exhausted when you finish.
