I installed this little prep/bar sink as part of my kitchen remodel, and it is draining very slowly (cannot quite keep up with the new, pretty low flow, faucet). I'm thinking I did something bone-headed, probably with the Stud-a-Vent. Here are a couple of pics. After it goes through the floor, it just goes to a 90 elbow and then a long correctly-sloped run to existing drain lines. I don't see what else could be wrong - can't possibly see how if could have gotten clogged. TIA !