I just got a new rig (Yeti 575) with XT rear der. and SRAM Attack shifters. I'm having problems with shifting on the rear. When I shift to a higher gear (i.e. smaller cog) in the rear, everything is crisp and fine. However, when I shift to a lower gear (i.e. larger cog) in the back, the chain skips around, and doesn't seem to want to settle into gear. It's especially bad when really hammering hard, e.g. climbing. No amount of playing with the barrel adjusters seems to help. The guys in my LBS said something about "full length housing = bad" and that "SRAM Attack doesn't work well". I've run SRAM 9.0 on my old bike and LOVED it. HELP ME- this mis-shifting is driving me NUTS!!