The most common issues are friction in the rear cable loop- make sure that the length is right

to avoid any angle where it goes in to the RD, & hanger alignment- can be bent inward. The alignment tool is worth the investment if you do your own work.

A pro tip that I have seen is to add a washer under the RD mounting bolt to move it outboard slightly (reset the limit screws).

This gives a bit more spring tension at the outboard end.