Quote Originally Posted by KnottedYet View Post
Try moving it more. Two smidgens. Three smidgens. Four smidgens. Move the shifter enough that the cage is centered relative to the chain. (trimming it means centering it or at least moving it enough that the chain isn't hitting the side plates of the der cage)

It could also be that the cage is set at a sharp angle to the chain line where you just can't trim it.

If you can't figure it out and do take it to the LBS, have them show you exactly what is going on and exactly how to fix it. Knowledge is power!
It only allows me to move it one smidgen and the next one puts me onto the next ring - it is indexed only. I will ask for more information this week when I take my bike to get the new saddle. Last week they adjusted the location of the cage and also changed where the stops were?

At least I got to see what is actually happening and can have a better discussion about it. Thanks!