I purchased a Kohler toilet about 6 months ago for my bath remodel. I finally got the bath finished after a sequence of delays. The toilet is about 1/8" off level in the rear (see photo) and rocks significantly. BTW, this was not a cheap toilet so I'm a bit miffed. Before I try to exchanged it, I wanted to check if it's reasonable to do so. I know I can shim it but I feel like this is a manufacturing defect that shouldn't have left the factory. It's a Kohler Cimarron from HD.