I would like to make a few additional suggestions to added focus trees. I would like to suggest the addition of Duetschland Erwache , British Overhaul, and New Soviet Focus Tree

I've not noticed any issues with any the mods or compatibility issues except for 1 mod. That would be the British Overhaul mod where an entire province in Turkey appears to just disappear into a no mans land. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1431594154

Aside from that I've noticed no other issue.

Edit: I've noticed 1 breakdown. It appears to crash when you attempt to plan naval invasions when you click the port that you are going to be invading from.