Before I read that you had tested the cables I was going to suggest replacing. Newer teflon lined housings and stainless inner cables work substantially better than their predecessors. Also, steel cables have a way of oxidizing, even sitting in a basement, so it's inexpensive to pull them out and replace. Assuming you'll re-tape the bars in any case...if you need to get the aero housings off the handlebars. PG