I just wanted to add that I'm experiencing overheating issues as well (gearvr s7 sbs 180 with airscreen). Can get maybe 10-15min play time then overheat screen pops up. Device is very hot.
I tried the same files with two other players (moon and pigasus) without any issues and was able to play for 20-30min or even longer. No overheat warning. Phone feels substantially cooler to the touch with both the other players.
It really is great to see skybox app coming around and including a lot of nice features, although it seems some optimization might be needed?
Also, the Airscreen app (v2.2beta mac) still seems to be a hit or miss with connection, startup, and crashing. A fresh install on Macos 10.11.6 asked again for xcode (I denied it) then seemed to install fine. Sometimes it launches quickly, most times it takes up to three minutes to appear, or even not at all and will need to force quit. Honestly, I've tried the app on 10.11 10.12 10.13, on three different machines, and have not had a reliable experience with any of them.
Your Airscreen app seems very similar to moon players and it has no issues on any of my computers, starts up every time and quickly.
Hope this feedback helps.