Maybe this helps a bit. https://hoverflytech.zendesk.com/entries/21786178-castle-creations-esc-settings
You can try and advance the timing a bit. The whine at startup is normal I was told its a safety feature.
George can you please check your emails. I am no 3#. Have been trying for a few weeks to get through with no success. You send me an empty invoice for my V2 exchange. The old V1 was send back a while ago.
You want to keep the motor under 60C degrees. Since many others are running your motors on 4S with larger props for some time now I wouldn't worry too much about temps.