Nitrado have been really helpful so far with their support, almost had live support yesterday with a staff member who was really patient and helpful.
This thread is about updating people with my current progress, so it may help you.
Renting and playing a 12 player 7D2D A20 Experimental Release Server.
1 - DO NOT do RWG, it is broken. Do PREGEN or Nav. The server has a 99% chance of just never working with RWG.
2 - You need to reduce the zombie and animal limits. Even the standard are too high and cause significant issues.
3 - A20 seems almost entirely server unfriendly. Cant handle even 1 player loaded in, let alone 3, let alone 12!
4 - There is substantial desync in the game. Currently being worked on. It runs smooth as butter, then there are 30-60 second desync spikes, then it will run fine for a few mins, then short 5 - 10 second desync episodes, then the server crashes. This repeats over and over. Has been for quite sometime. The server shuts down and restarts upon the crash. Obviously this is incredibly inconvenient . I have kept the Nitrado team updated with the progress and testing to see how they can help.
5 - No settings have been altered to make them higher, bar 200% xp and 180% loot (which has minimal impact)