Would like to replace this unit with another round bowl, one piece unit. Only have about 14 inches of knee room, with a 14 inch closet bolts to wall measurement. Any suggestions for an elongated bowl that is at least 16" off the ground (floor to top of toilet seat)? What would the Toto unifit contraption do the trick? Any issues with the unifit and clogs as there appears to be another "elbow" now for potential clogging. Thanks.