Great Dryer!
The dryer might need a delinting to remove lint in various areas of the dryer including the blower. That dryer is the pre-Halo of Heat design from Maytag that was check-rated by Consumer Reports. The heat buttons should be Air Fluff, Regular and Wash and Wear, if I remember correctly, with Wash and Wear being the higher heat because Wash and Wear fabrics had to be heated to around 165F to relax the wrinkles. With the dryer running and empty, open the door and hold in the door switch. Look up at the top of the drum at the heating element and make sure that all of it is glowing. It is an open coil element strung through a metal frame with porcelain insulators. It is not uncommon in elements of this age for a section of wire to break and short to a nearby wire resulting in only part of the element actually producing heat which could slow drying.