Seriously? Another thread? LOL, over 83% humidity? LOL. No, you haven't killed them. 85% is, in fact, the humidity that I shoot for when hatching ducklings (and I have been doing this for 25+ years). Why would that level concern you? It is well within the range of normal and seriously by this point in incubation, it is way too late to worry if your humidity had been too high.
Didn't a couple other people already say not to worry until day 30 or after? Runners typically hatch later than other Mallard-derived breeds and it is completely normal for them to take 48-72 hours from pip to hatch. I would sit on your hands and just leave them be! LOL. Nothing ruins more hatches than messing with the incubator during "lock down".