Dura Ace 10-sp. 53-39 with a newly installed Ultegra 11-28. shifts nicely except from 14 to 13 in the 53-teeth ring. New cable installed. LBS has adjusted it a couple of times. Works on the stand, but not on the road. New SRAM chain. I noticed the spring inside the RD was gunked up so I hit it with wd and a tooth brush. I don't think the hanger is bent. Any clues?