I have this odd issue with the return cable tension on my 2010 RD. It shifts fine up (bigger cog), but sometimes it hangs or doesn't shift down (to the smaller cog). This became real obvious recently with winter.

It's kind of intermittent too. It's not the cable housing thing either. I have changed those and the cable moves freely with little effort.

Did they change the spring or geo on the 2010 that the "return" cable tension is way lower?

I'm thinking of putting my old 2008 x.9 back on. It was a bit worn on the pivots, so I thought I would replace it.