Kohler toilets don't have many supporters on this forum. You can do a lot better. Toto has many models to chose from, all of them perform well. I'm not a professional plumber, but in my 4 years or so of lurking on this forum, I have never heard of the brand or models you name. Toto is the largest manufacturer of toilets in the world, and their quality is the gold standard of the industry. I would suggest you go to the "Toilet Review" link at the top of this page. Then select "Shopping" followed by "Toto" toilets. You then can scroll through the many Toto models and check their individual specifications. I am quite confident you can find one than will work for you. Toto's are not always stocked by supply houses, but plumbers can order them. I believe Terry had a Will Call arrangement in the LA area at one time, but I don't know if that is still current. I just checked, and the LA will call is still in effect.