Am I the only one here who doesn't *love* his Toto Drake? I find that I'm constantly having to clean the back wall and the underside of the seat. The flushing power just does not remove all residue. Perhaps it's because I didn't buy the elongated bowl. Who knows? But is there a way to increase the water pressure or treat the back wall or hack it some how to improve performance? Or do I need to consider a replacement (which one?).