First, using a flexible hose on your dryer is costing you money and can pose a fire hazard. It slows the flow down and gives places for lint to accumulate, further closing things. A dryer is always best served with metal, smooth walled ducts without screws holding it together to catch lint on.
A more common exhaust vent location is if the duct runs throught the floor joists above the dryer. Now, depending on which way they run, that may or may not be possible or desirable on a retrofit.