I figured out the problem...I'm an idiot.
It was a combination of 2 things: My beer line had air in it, and it was wrapping around in a way that made me think it was my CO2 line. Mind you, that investigation took place after a few pulls of the tap, so I guess there were 3 things!
I checked out the coupler and everything looked ok. I retapped the keg and made sure that I had a nice tight seal. I turned the coupler as tight as I could without breaking it which I don't think I did before. On the next pull of the tap, all of the air came out of the line and there were no air pockets. It seemed like it poured with less foam too. Maybe this whole foam issue was because the seal between the coupler and the keg was not airtight. I'll try again tonight to make sure. Thanks for the advice!