Why does my dryer get too hot?
The vent duct being clear is a good sign but it's possible it's still causing restriction and that's contributing to the heat / smell. You should be able to look up the maximum duct length for your dryer (you'll probably need the exact model number, not just the product line).

Barring more stringent requirements from your manufacturer, you should shoot for a maximum 25 foot vent, minus 5 feet for every 90˚ elbow (2006 IRC). So for your double bend, the total length of the ducting should be less than 15 feet. (If the duct is less than 4" across or is made of that flexible foil material that will add additional restriction. But if you have a foil duct you should really consider replacing to reduce the risk of fire.)