2 - no!, leave it in there, don't saw off any as you could cause damage to the weave which may propagate up the post to the pressure area. anyway it's carbon and light as fuck, so leave it be.
*although mdcc may have better info on this
3 - as you've overtightened the post, have a good look around the clamp area for crushing/nipping damage
1 - http://www.chainreactioncycles.com/Models.aspx?ModelID=75810&gclid=CKPQ4cSR7LACFYXP3wodlTdzyA
2 - no!, leave it in there, don't saw off any as you could cause damage to the weave which may propagate up the post to the pressure area. anyway it's carbon and light as fuck, so leave it be.
*although mdcc may have better info on this
3 - as you've overtightened the post, have a good look around the clamp area for crushing/nipping damage