I tried the same conversion on my ten speed with mediocre success at best. I added a 12-34, new cable, new chain, etc. And when you have the bike on the stand, it works well. It took me nearly a week to find the right cable tension, and then it was never really sound. Once I road tested it, under load, the rear derailleur is in a constant state of wanting to shift, you hear it, and feel it through the pedals. With the chain line right down the middle, it's silent and efficient at moments, and then depending on the attitude of the bike, will ghost shift up or down. The B screw tension is within Shimano specifications, the chain is a Ultergra directional 10 speed. As a measure of test, I borrowed an old 9 speed Shadow XT, installed it, and it ran through the gears flawlessly. The wider jockey wheels have no affect on the narrower chain. Wolf Tooth tech support has been great, but they have no idea what's going on. I am wondering of you had any of the same experiences. If I can't this working, I am going to an old 9 speed rear mech, which works perfectly with the 1:1 pull ratio.