It looks great. You should post a video clip on YouTube so we can hear it.
Several people have installed an OEM M6 bumper skin on their 650 using the standard aluminum 650i reinforcement bar. So I don't think buying a CF OEM M6 bar will help you. The guys had to drill some holes in the 650i reinforcement bar to line up a lower bracket in the M6 skin (due to the slightly different location of the lights on the bumper) but otherwise there were no fitment issues.
I think your problem is with the Duraflex bumper, not the carrier bar. Do you know what/where the clearance issue was?
Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater