As I told you in the comments.

I've had this with vanilla DEI every time I tried aswell, it does not work well in MP campaigns. But you will likely make desync issues even worse with overhauls and submods like this.

Try doing a campaign with just DEI part 3+2+1 and no other submods, it will be the best chance of success.

we've tried it, it ends with an endless dysync circle. I didnt realize you were the actual developer of 229, its really an excellet mod for MP, best ive seen

multiplayer seems to be working now

Its working well at this point