I wonder if you might also want to consider a bigger starting boost for the Seleucids. I believe that XGM uses a script or some other method to improve their starting position, but I haven't seen them do very well at all in my two campaigns so far. In my GCS campaign they held on for over 100 years but never really expanded. In my current Carthage campaign it is about 250bc and the Seleucids are already gone (along with Pontus). Pontus fell victim to a very successful GCS (they have all of Anatolia) and Seleucids to the Ptolemaic empire. Scipii is also gone, strange enough. They must have lost all their family members.

Has anyone seen the Seleucids become a power in their campaigns? I know that the Seleucids have difficulty expanding in Vanilla and all the mods, but I thought that with the fancy new XGM units and so on they could make a go of it.