Dryers really just do three things. They tumble so that there can be some separation in the clothes. They heat the air to change the liquid water into vapor, and they pull air through the drum to remove the moist air. If you feel heat during the cycle you have to think that air movement is the problem. Pull the dryer away from the wall, disconnect the vent, and dry a load to see if it makes a difference. I recently had to crawl under my house to clean our vent for this very reason. Dryers will move lots of air but not with any great pressure. They don't make moisture disappear, they just move it somewhere else.