I have a "biscuit" colored Kohler enameled kitchen sink, left well is deeper than right. I had the disposal put under the deeper left side, the water drains slow. My husband thinks it has something to do with fact that right sink is higher so water doesn't drain right. If the disposal does in fact need to be under the more shallow sink, then can we move disposal without leaving "scars" around lip of other sink drain...this is my main concern. Or is there a way to fix the under sink plumbing so water drains better. I could take digital picture if this would help diagnosis.