While browsing through your great script (you should touch up the mission though, that is probably the worst place on Everon to have it. Try something with some buildings
I tried St Pierre and it was fine.
The only thing I will say is that the waiting times for everyone to get into possition can get really long at times. Is there a way to do this without waiting for everyone to catch up first?
Also, whilst browsing through your script I saw the following line:
hint format ["%1", _poss]
Is this really necessary? Surely this is the hint that everyone keeps complaining about.