Without knowing which way the final bend goes, I can only guess that you have created a trap in the steam line. If that is the case, you have created a "water wall" in the line that the steam will have to fight its way past. On top of that, some water will be pushed up through the remaining steam line to reach the outlet. Each time steam enters the room, this water will be expelled into the steam room, which is what it sounds like you are experiencing.
I would recommend speaking to an Installation Specialist
who can help you determine the best way to correct your sputtering steam head.