Actually, Bactria doesn't need to get any stronger; currently the problem with the Graeco-Bactrian faction is that it expands into the wrong way. It's not uncommon that they reach Persis proper, and this is not a huge offense but India should be the focus of the matter. The Seleucid-Ptolemaïc struggle should end with a strong Seleucid Syria, and with a weakened Egyptian heart-land; Pontos aptly dominating central Anatolia, and Hayasdan being the major power in the Caucasus and northern Mesopotamia. Saba needs some control, historically within the EB frame of time, they never reached as far as Gerrha or Oman... Or in the few crazy cases Charax.
But then again, these are all idealized situations rigorously following historical course of outcome.
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