I just installed a Kohler Cimarron round bowl in a remodel at my daughtr's house, and the water spot in the bowl seems very small, just barely covering the discharge from the bowl. Kohler's website says the Cimarron has a "large" 10" x 11" water spot. I am pretty sure that isn't what we got in the one we installed. How do I adjust this? Any thoughts? The homeowner's guide isn't much help.