If it's stick, then you should fix that. I have seen gunky, sticky resopads on old Conns.
...something I have noticed, though...the solid silver Resotech resonators ARE massive enough to slow the action down noticeably. At one point, I acquired a baritone sax with oversized silver Resotechs, and had to beef up the spring tension substantially to get it to play. Eventually I replaced the resos with thin, brass seamless domes (very light) and lightened the horn back up. Much snappier response. That said, the Conn resopads are not noticeably more massive than ordinary pads. Probably pad thickness is more significant, but also NOT.
Don't know why the silver resotechs are so popular. I hae had several customers ask me about these since my episode, and have talked them out of it by having them 'heft' the Resotech I took out of the low A on the bari vs. a comparable size seamless dome.