Isolation platform - Gingko vs Mapleshade

Hardwoods ain't soft sounding. They're hard sounding, meaning dynamic and tight as a bull's hindquarters.

A well constructed bungee cord suspension system will crush a Symposium.

None of suggestion with the possible exception of Minus K actually address all 6 degrees of freedom which is actually required for true and thorough isolation. Even Minus K IIRC disengaged the twist isolation so that it wouldn't interfere with turntable rotational motion. One method that will get you pretty close to the sacred 6 degree of freedom isolation is a combination of say springs or airsprings or Ginko balls and set of roller bearing assemblies like Dhurama II. That way you achieve very good isolation in the vertical direction AND very good isolation in the HORIZONTAL and rotational directions.

Since the laser is suspended using a spring system with resonant frequency around 8 Hz, I'm guessing, then the laser itself is subject to structural vibration with frequency in vicinity of 8 Hz, no? So, there would be a good reason to employ an isolation device with a very low Fr, below 2Hz if you can swing it, since you want the mechanical low pass filter to kick in as soon as possible to reduce vibration at 8 Hz as much as possible.