A few Apollo questions

I switched from Sunshine to Apollo yesterday and everything has been working great at first glance. I do have some minor hiccups though which I hope to get some feedback on!

• Headless mode and audio sink.

Turned it on but it doesn't seem to work, my two regular PC monitors stay one while streaming to my TV. There is still audio coming from my speakers too despite having turned on the option on my client to mute the host.

• Resolution and FPS

I'm streaming to an LG G3 and was wondering if I should keep the 4K 60FPS setting in moonlight or give it a bit more leeway? I know that I will not reach the full 120FPS that my TV technically supports, especially not with the LG Moonlight client only. On a similar note, should I turn VSYNC on or off in game?

I hope these questions weren't overly redundant. Looking forward to