If Herbies will work, great. I have my doubts but you never know. What definitely will work is a two-pronged approach: springs under speakers (not just the subs) with springs and added mass under the turntable. I was surprised at the improvement putting springs under mine.
You can buy plain springs on-line real cheap. But its a lot of work because they need to be sized correctly so that the springs are about half way compressed under load. Nobsound springs on Amazon are only $30 and very effective under both speakers and turntables. Also amp, CD, phono stage. Use them everywhere.
By far the best however are Townshend Pods. These also need to be sized to the component but they make this a whole lot easier. I was extremely impressed with the improvement under my turntable and amp. Had almost the exact same problem as yours, completely eliminated and even made everything a whole lot better. https://systems.audiogon.com/systems/8367
You can buy plain springs on-line real cheap. But its a lot of work because they need to be sized correctly so that the springs are about half way compressed under load. Nobsound springs on Amazon are only $30 and very effective under both speakers and turntables. Also amp, CD, phono stage. Use them everywhere.
By far the best however are Townshend Pods. These also need to be sized to the component but they make this a whole lot easier. I was extremely impressed with the improvement under my turntable and amp. Had almost the exact same problem as yours, completely eliminated and even made everything a whole lot better. https://systems.audiogon.com/systems/8367