Just checking, but you are running this on the deck while docked to a TV, right? I can stream just fine to the deck while undocked. It is while it is docked to the TV that is the problem.
I do have experience with using the moonlight/sunshine combo though, so if I have to go that route I can, I would just prefer a native steam solution.

Yeah, I am wondering about that as well. It sadly sounds like it might be a bit much for the deck, but we'll see!