I can do the same thing only better with four springs and a maple board.Congrats.🤗
I haven’t tried your springs (and never will for practical reason and esthetics) so I can’t argue with you. I have tested Townshend pods, I’ve seen the demonstration. It works. It’s not to my liking at the end of the day. All depends what the doctor prescribed and depends on user preferences.
I would rather trust Townshend audio explanation then yours. It’s physics. Spring will swing, even compressed ... the range will be smaller, much smaller but still. And vibrations travel through metals, no matter compressed spring or not compressed. The way through the spring will be longer (if you stretch a spring it’s a pretty long wire) but vibrations travel though wire.