The problem with heavy supports such as solid hardwood or granite is that it stores rather than transmits energy.
Agree with,...and that is precisely what,among other things,is the secret of "Ikea Lack",and that makes the modified table so good.
There are more modifications you can make to the modern Ikea Lack,but that I tell you about,.. if it becomes relevant for you to try out Ikea Lack.
But I understand that you do not have room for such a solution,but the table is so cheap so you should buy one and modify it according to my image.
Just to see where you end up in Soundquality, then you have a reference to work towards, when you try to find a solution that works for you.