Nice, clean whites, Rob!
My one "near white" seedling, a volunteer from 'Sacrament of Healing', has a lot of yellow in it, though it fades during the day:
morning and evening
It opens well here, but the flower size and scape height (never mind budcount and branching) leave something to be desired. (LFO was 5", scape height a dismal 21.5".) I am hoping that the plant will improve this year, as I rather like the flower.