Originally Posted by
UnfilteredDregs
It is slightly bent, and that is because when this issue first started showing up what was happening is I'd go to downshift in anticipation of a slope, it wouldn't happen until too much torque was on the chain. So yeah, a slightly bent hanger is in the equation, I told them to throw a new one on. Nevertheless, it is a new hanger because I ripped my derailleur off a few weeks ago in the woods.
Bent hanger is almost certainly the cause. A new hanger isn't automatically straight because the hanger mount can get tweaked (happened on my wife's bike). First thing would be to take it and have the shop tweak the RD alignment. You could also try fiddling with the micro-adjuster to see if its off by a very small amount.
Shifters are basically a yes/no thing. Either it clicks to shift or it doesn't. If it clicks the problem is likely cable or derailuer.