I think the housing looks too swept forward below the handlebars. With shift cable running under the bar tape, there's no need to come forward of the handebars once the housing exits the handlebar tape. Have it go towards the other side of the bike just past the middle of the headtube, and then back as it goes to the side of the lower part of the headtube and to the cable stop on the downtube. You have a fairly large frame and you're adding a good bit of unnecessary cable length by going forward after the cable comes out from under the bar tape. That's why the standard length cable is too short. It would probably be fine with more efficient routing as it exits from under the bar tape.