I'm on a second floor as well. My Avenger is on Stillpoints sitting on a DIY Stainless/ MDF/ PE Foam Platform. The Platform made a big difference. Eventually, I will get a Symposium Quantum. If I had the option, I would wall mount.
Another option I have seen is the Mcmaster-Carr Air bladders sitting between the stand and Maple Platforms. That looks like a good-cheap option. The bladders are around $60 each.
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