First I would make sure your clothes are being spun properly to dispense the water from them in the final cycle of your washing machine. If you put too many items in the machine then they won't spin dry in this cycle very well making your dryer work harder and causing damp spots in some areas of clothing.
I would make sure to not over-fill the dryer with too many clothes especially with heavy cloth items like jeans, towels, throw blankets at one time.
I would only fill it 1/3 to 1/2 full so there is plenty of room for the clothes to move and flip around so the heat can surround the clothes better.
I set mine on the Optimum setting (under the Cottons setting) and it does dry all mine very well. If you have heavier cloth items, you might set it for More Dry.