Me and my friend had success getting rid of OOS by creating a virtaul LAN and disabling events. We play on (Don't select) size (same as huge but with bigger research penalty/city costs) with 10 total players. Have come throughhalf of industrial era without desync. We also got rid of loading games getting OOS. Steam multiplayer coordinator sucks. Create a LAN. You can search my post history to find the solution we use. Hope you have fun playing RI. It's a great mod! And more fun to play with a friend.