As someone who takes Clarendon every day, I suggest that one takes the car lane rather than the bike lane. Bicyclists will often be riding as fast as traffic, which is too fast for staying in the bike lane, particularly considering the proximately of parked cars and the condition of the pavement. In addition, this makes you more visible to drivers, particularly if you traveling at higher speeds. Drivers do not anticipate being overtaken on the right, particular by someone in the bike lane.
I would also suggest that the county convert this downhill bike lane to sharrows all the way from Clarendon to Rosslyn.