I use 12/13-23/25 cassettes on both my 9 speed bikes w/22-32-36/38 rings.

Since I don't need the chain wrap capacity of the Altus level RDER's (mine are 29T or less), I thought I'd try a Tiagra RDER since it should "theoretically" shift a "road" cassette more crisply. I typically ride as a 1X9 using the middle ring.

I played with the B screw adjustment until the cows came home and couldn't get it as good as the Altus.