How many kids, no bath vent fan, put one in. there is a big part of
your problem. Kitchen vent fan?
Does your furnace use outside air. Does your drier vent outside.
Attic vent size is determined by sq ft of attic, a ranch has alot of sq
ft.
Leave basement insulation.
A vent recovery system i think they are called, or air exchange system
brings in fresh air and warms it through a heat exchanger so you dont
waist energy as if you opened a window . some dehumidify .
Dry sinuses, maybe you need more air exchanges in the house,
Check your humidistat for accuracy and get another one.