I have a Jamis Nova Pro frame that I have set up for commuting with mixed Shimano 9 speed triple road group (Ultegra 6503 series triple shifters, FD and brakes, 105 long cage RD).

This is the first bike I've ever set up with this cable routing - the RD, rear brake and FD cables all run along the top of the top tube. The RD cable then runs down the seat stay with the final cable stop several inches up the seat stay.

You can see from the photo how I have the cable housing cut. It's quite a huge loop, and I have taken to fastening it to my rear rack to keep the loop from flopping around. Even with this huge loop, you can see the cable connection to the RD is not that great - it does not go straight into the RD, but there is still an angle at that point.

Any hints how to do this better? Of course, I can try to just cut the housing shorter, make the loop tighter, but I think that would make the routing to the RD even more of an angle going in and maybe make the shifting worse. (it's not bad now, but not as perfect as the same RD and shifter was on my road bike).

Thanks.