I have a felt f1 carbon with an Easton ec90 slx carbon fork. I have only been on three rides, but every time I go out I find that the headset has come loose. The rides have all involved a screeming decent down flagstaff mountain road and this requires alot of front break. I have zipp 404 wheels and 05 zero gravity breaks. I am using the cork pads but the breaks are real strong and can be a bit graby, do you think they are to much pressure for the clamp bolts of the stem and it ends up working its way up the stear tube? The stem is an FSA carbon and I have tightened it as tight as I dare. Do you think the problem could lie in the stear tube?