I am having a problem with my new sink setup. I had a double bowl and went to a single bowl sink. Now when I put water in the sink the water drains slowly UNLESS i take my finger and push the disposal guard down to increase the opening more, then once I do that there are a bunch of air bubbles that escape and then the water will drain fast. Do I have a venting problem? It is the same disposal and guard that I had before so that is not the issue, there is nothing clogged.