OOS - help desperately needed

Hi, I've been trying for ages to get this game to work in mp, tried
175(c), 176 beta 5 and beta 6, nothing helps.
After a few rounds (playing 2 players in Lan) we always get OOS. (And yes, we both have the exact same versions)

I tried: cache deletion
"customAssets" deletion

selected "no revolutions" and "no random events" on game start, nothing helps.
I've been browsing this forum and the internet for ages, please advice!

Does any of you (or both) ever change anything in the Bug?

Try reinstall everything, deleting all folder containing civ inf, include the beyond the sword folder in mydocument-games.

than start a game with moderate civ and map size.
you can allso try without barb.

We switched back from 176 beta 5 and 6 to 175c. Seems to work now.
However the game seems way to easy (playing Giant earth map for AND 175), as my Capital Berlin has Lvl 16, Moscow, which also has a decent starting position has only level 6.
Plus after 320 rounds Russia has only 2 cities (most other civs have 3), which is really low as they have vast space to settle in.

Russia is only the example, all other bot civs suck too. We started giving techs to them for free, to no effect. Their culture seems so be spreading extremely slow to, compared to ours (Noble Difficulty). I also tried to raise the difficulty ingame, but that only changes factors for my civ (less income etc., and does not improve the bots).

Any explanation for that? They used to do better in the betas, built more settlers and acted more aggressively, despite the very same settings at game start.

My Score is around 230, whereas the next best bot has 90, my difficulty is noble.