I'd had looked on zwiftpower sign ups before the race and made a note don't chase this person on the up hill finish . I did on the flatter bits and closed the gap down but it just ballooned on the last steep bitRe the ZRS, yeah, it's still well and truly b*ggered. I still look at the w/kg of riders signed up before I will join a race as far too many in the wrong category.
Re your set up, could it be the 3 sec ave setting?