Humid in summers in NY? I live about an hr north of you Jackie, ive never noticed it to be overly humid or humid at all much. That being said i grow my zygos in med bark, perlite and charcoal mix, they do great! I water twice a week.
My hygrometer usally hovers between 20-30% humidity in the summer in this area, i keep it in the high 60% in the grow room and the zygos do fine with the bark mix. Ive noticed most growers avoid using spagnum in the northeast as its conditions can be very erratic in our area.