What amount of moisture is acceptable in a mostly dry concrete basement?
I have worked on homes that had a drain trench around the entire basement that drained into a sump and was pumped out, the walls were always wet and a dehumidifier was needed in the winter. With the levels you have listed I would not worry at all. If the 1 location that gets wet gets worse or larger some exterior work may be needed to get the water away from the wall. The dampness will not affect the concrete, think about all the bridge pilings that are in &amp; under water. If you don't have a mold or mildew problem I don't see anything wrong with hanging clothes to dry. We have a large kettle on our wood stove to add moisture to the home probably not much different to the amount the clothes provide plus it saves energy.