Hello !
I have a bug that I can reproduce each time.
Create with copy a custom synth race like the yor (modify just the name), then create a new game, you'll have the right tech tree, now close the game, enable mod, copy only the GalCiv3GlobalDefs.xml (the right way, on the right directory mods/whatever/game), then restart take your custom yor race and create a new game, now check the tech tree, it's not the right one...
so if you have any mods that have GalCiv3GlobalDefs.xml modified, you can't have the right tech tree, is there a way to force a tech tree for a custom race ?