Mass won't help on a suspended hardwood floor, you need some form of decoupling at very low frequencies. Simplest thing to try would be putting some racketball balls under your massive oak base. You can use something like these to sit the balls in so the turntable doesn't roll off the shelf:
https://www.amazon.com/UPKOCH-Plastic-Seasoning-Dipping-Appetizer/dp/B0851BLV7X/ref=sr_1_11?dchild=1...
It's cheap and effective in a lot of cases.
https://www.amazon.com/UPKOCH-Plastic-Seasoning-Dipping-Appetizer/dp/B0851BLV7X/ref=sr_1_11?dchild=1...
It's cheap and effective in a lot of cases.