Ozzy, I get that, but wouldn't you think there is some optimal amount of compression for these footers. Some footers are offered with different models of same footer, depending on weight of component. Another, are those popular multiple spring footers in which individual springs can be removed or added. Idea is optimal amount of compression for weight of each component.
Back to these footers, lets say component weighs 20lbs, each footer compresses to certain point, 40lb component will further compress footer, there may be a certain finite amount of compression that will sound best. If this case, I'd expect lighter weight component may sound light and airy, compress footer further, may sound darker, more muffled. If this not true, why would footer sound change over time? I'd suggest your footers settling over time to it's final compression setting, you may or may not have found it's sweet spot. Will every component, regardless of weight find this same sweet spot?