I guess what problems are you having? I've used steam link before perfectly fine but it's going to have some loss over the network. Are both computers connected to a gigabit lan? Balder's gate 3 is a newer game, and while you aren't on minimum requirements you are on mid tier hardware using proton to run a windows game, so there are a few reasons you may be having problems. Best way to run it down is isolate things and see how they go. Try running game directly on the computer with monitor ect.