Since my last post, we've brewed our porter twice again, once with no changes, and once with changing the SafAle to liquid yeast. The licorice flavor was still present in the first batch, and gone in the second. Sad to say, but I think it was the SafAle that was doing it. We still use SafAle for our Pale and have no such flavor so I think it's perhaps the way it handles/compliments the darker brews that allows the licorice to come out.