Lead, lead and more lead. I know, dangerous, but if properly handled and sealed in the columns in an outdoor space, it will do the best to improve the sound.
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If you want a permanent solution to mass loading, I suggest lead encased in epoxy resin. Let me explain. Depending on what morphology you find the lead readily available in your area will dictate how you should apply it to your situation. IMHO, get the smallest circular (ball) shaped lead that you can find. Do NOT just add to the stand and be done with it. You have to keep any possible micro vibrations from traveling between each particle of lead. And no, just filling with teeny-tiny pieces is not going to work. Purchase a pint of epoxy, mix the lead in with the epoxy so as to coat all the lead. Pour this into the stands, and there it is. Further decoupling from floor will achieve the best base response you have ever heard. And, make the stands almost impossible to move. Cheers.