JPXI – bridge 'hums'

One final JP XI question. Recently acquired it – love it sounds great feels great etc…One thing I have noticed with the floating bridge and I’ve never seen this with any other float bridge.

When you play certain chords open chords or do heavy palm mutes then open chords then you do a hard silence (by muting with left hand) sometimes I notice the bridge starts to vibrate ever so slightly and it creates a hum you can hear through the amp. Has anyone seen this before? IS there a way to fine tune the settings on the bridge so it doesnt hum?

Any ideas?