Barrel is definatley softer then the Iconic.. takes about 50-75 to start opening up and the barrel changes sound... around 800-900 cuts it still passes compression with flying colors. The handle is a little stiffer then the Iconic. To be honest it feels alot like my 13 Aftermath, and also...
The click in the handle is most likely the roll pin in the knob... If you take your grip off take a look at the roll pin see if it is coming out.. I have had that happen on a few of mine and just tapped the pin back in and the click went away
Its most likely the rod in the handle causing the vibration sound. Yes the Iconics are more noticable but i do have the same thing in my 17 USA Aftermath also