I read the previous post on this toilet. I recently bought the Kohler Cimmarron and installed it in a 2nd floor bathroom I added. When I flush the toilet it flushes rapidly with an initial bubble of air as it is flushed. The bowl also does not fill up very much after the flush is complete. It has its own vent and there is no leakage anywhere. There is no clogging issues since the toilet and piping system has not been used. What would be causing this? Does this sound like a problem with this particular toilet? I'd appreciate any advice. Thanks! Jeff