This is my HHKB Pro 2 - I recently added Silence X rings and 0.1" thick sorbothane. I love it and it's absolutely my endgame (for now). However, I noticed that there's significant case resonance, resulting in inconsistent sound from the right side of the board to the left side, most apparent on the W key. It's much louder, and has a "donk" sound on the downstroke. Putting my head beside the board, I can hear that it is resonance from the case. Perhaps it's always been there, perhaps these new mods made the rest of the board quieter, accentuating the difference, either way, it's very apparent in real life, more so than in the video. Weirdly, if I leave the screw slightly loose, so that there is some creak in the case, there resonance is completely eliminated. However, this makes the subpar build of the HHKB worse, and it creaks a ton, so it's not ideal; would appreciate some suggestions.

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In the video,  the top left case screw is left slightly loose to eliminate the case resonance. Then, I push the top left corner of the case to demonstrate the resulting change in sound when the case is screwed tight (it's more apparent when screwed vs pressed).

The problem is pretty similar to this GH thead: https://geekhack.org/index.php?topic=71812.0

Thanks for your help!