I tried the seatpost clamp. It's solid. Checked the saddle rails too, nothing budging. I'm 99% sure the bar/stem combo aren't to blame, but there is an element of doubt in my mind about them. You can really bounce on them though, there's no noise from them even when you try to snap them (not literally)! If it makes you guys feel better, my cycling buddies and owners of the LBS are stumped too.
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Matt
2018 Enigma Excel Pic|| 2010 Kinesis Decade Convert2 Pic || 2008 Kinesis RC2 Pics || 2007 Kinesis Pha5e Pics || 2005 Kinesis RC Pics || 1996 Raleigh Max Pics