Yes it's a carbon steerer. I'm pretty sure that everything is under-torqued right now.

I need to invest on tools, agreed. I ordered a Ritchey Torqkey from PBK last week to do the stem and seatpost, I didn't get it yet.
I asked a friend to borrow his torque wrench to do the compression plug. 9nm is correct, right? That info is hard to find on the net.

My LBS will take a look at it Monday if I can't fix it by then.