For your 1st issue:
This is a known issue with the GSDK plugin, Set Default Server Host Port crashes it, you have 3 option.
1: Disconnect the Set Default Server Host Port from your Init when you test in Editor Window(PIE).
2.try using Standalone Game when test your game, Editor Window(PIE) always going to crash.
- (im using this) if it still not good there is an older version of GSDK plugin what works fine with Standalone Game mode, also put a Branch after your Set Playfab Settings with a IsDedicatedServer .
The reason behind this if i remembers right, for the GSDK plugin, the Instance needs to run on the PlayFab servers to work, cannot make it run on your local computer. So whenever you press play the engine tries to open up a local instance for you but its crashes instantly as its not running on PLayFab.
for your 3rd issue:
Use Container Server type, not Process.
i cant help with the 2nd issue, sorry.