Recently there's been a few threads where the OP was having difficulty downshifting and included a few posters who had problems with upshifting as well. One cause might be drag in the shift linkage that doesn't allow the shift mechanism to return to the center before the next shift is made. This was a good reason to take more parts of my bike apart and see how they work. I took my shift lever off of my '10 Custom with the thought of cleaning the old grease and replacing it with moly grease, as well as lubing the two heim joints. Much to my surprise the shift lever pivot bushing was dryer than a popcorn fart! Now maybe I'm just the unlucky bugger who's bike was assembled on a Monday or a Friday but it made me think that others may be in the same boat. it's easy enough to take off and have a look. I actually took the whole linkage off and gave everything a good cleaning before greasing up the bushing and shooting oil into the two heim joints. Total time was less than a 1/2 hour.