Blake, in addition to checking the routing, you might also want to pull the cable out of the housing (can't remember if you can do that from the speedo without unclipping the gear, but I'm pretty sure you can pull it from the tranny side), and check for a "kink" in the cable and for good lubrication...the grease looks like regular chassis grease to me, it doesn't look like a motor
oil type lube.