I'd suggest to contact the game admin via PM of these games to get the password of the game rounds.
I remember an old RPG (enabled EAI) with an inactive Arabia (became inactive day 105).
Needed twelve days to take out all the mechs and the AI took Creete (starting attack from Cairo).
So everything you say is the normal behaviour of EAI.
Mechs are already underpowered. In former times you could kill 50 infantry units with 50 artilleries, now you fire and at least 9 of 15 units survive the first shot. I think the long range units need more power instead of less power!
A button to delete all received messages would be nice
So you could clean up your conversation without selecting all the defeared players.