Yeah, caliper tune can matter a lot... BITD, it was common to be able to make a lot of improvement by overhauling ye olde single pivots, until Shimano did the reversed spindle with beefier diameter, which pretty much made em set and forget, especially on 600 and Dura-Ace with the thrust bearing.
Every dual pivot uses that arrangement, but the nastiest ones can still be a bit too nasty to tune properly. I'd consider Tiagra quality to be minimum decent.