I'll keep an eye on mine. The only time mine wasn't shifting well was due to the retaining bolt on the left side backing out, causing the assembly to be able to shift from side to side. Index that! I finally cleaned up the threads really well and re-torqued the bolt with blue loctite and so far it has been fine. I have about 800 miles on mine, I guess.

Does your SRAM derailer work fine with the new crank set? X7, I think we have....