What you are hearing is your chain. Think about size of each link on your chain. If it travels around a small/smaller cog it is going to be articulating more. On larger cogs it articulates much less as it travels around (that's why ceramic speed made those ridiculously expensive oversized pully wheels - it's supposed to increase drivetrain efficiency). You are never going to make it silent, it's mechanical movement. Find a lube you like and think of it as the sound of a perfectly tuned drivetrain (assuming it is perfectly tuned).