OK if i understood the Bottom bracket Cable guide is too short? Well U can get a new one at ebay or the web, but usually the issue do not affect the performance at all. I have seen that in several AL bikes and they work fine. My old Ridley had the same problem. Well I was using campagnolo anyways, not sram.
If the frame was Carbon I would be super worried but in steel and aluminum isnt a problem at all. Wonder what kind of cable are u using anyways. Probably thats your problem. I have no experience with sram niether with last shimano components generations but probably the problem is the way the cable is twisted. My sugestion is change it for something like the shimano one the shimano cable threads are super soft and the campy ones, I suggest shimano cables because I doubt the campy cable set will work in sram at all, probably im wrong.
Thanks