Might be a bit late, but what I did was I used my generals like crazy. They make excellent units, and if you lead them right, they can rank up to 3 gold chevrons in a matter of several battles. Once you have that, lots of archers and a couple of mercenary phalanx or red sea hoplites. I found that the successor cavalry were a huge threat so I focused on anti- cavalry infantry that could also hold a line so that the archer spearman could rush in the back and just bombard the rear with flame arrows. I've managed to crush elite Ptolemoi phalanx and galatians with just a few red sea hoplites and archers using this method.
Plus, when expanding, focus on Africa. I haven't finished my campaign yet but I never went all the way up the Arabian coast near Seleukia, I put all my power into South Africa, developed the cities a bit, and turtled my way up the Nile. I have memphis now, I'm about to take Alexandria and the Ptolemoi seem to be pretty much crushed while my economy is now booming thanks to Memphis. Keep in mind my economy was roughly the equivalent of crap throughout half the game and the only reason I stayed in the fight was because of my battle strategies to take out the Ptolies.
Plus... Not sure if this was just chance or if this really was helping me, but try getting a team of five assassins and target Alexandria. I noticed that from taking a settlement the repairs for wonders can go up to 20k, so I kept sabotaging the lighthouse and tomb of Alexandros, and it seemed like their finances just plummeted.
Hope this helped some. =]
Bookmarks