You are searching for solutions of problems that do not exist. In EB you do not need high experinced Agema Phalanx and artillery to win against Lugoae, Gaeroas and the like half naked savages. When I go for Segesta in all my many Roman campaigns my army is composed of inexperinced Camillans, supported by some Greek allies from Taras (Hoplites and Peltasts); and I usually win this battle without serious problems. And that's ok, because my lads are better armoured and armed than this Celtic mob.
But when you insist in playing on VH/VH, everything is seriously messed up, beginning with the overaggressive behaviour of the AI (did you know that they get a hardcoded 10,000 mne bonus every turn on top of everything that the script is granting them?) and ending with barbarian levy spearmen that cut your professional Greeks to pieces.
So, it's quite easy: change the settings back to default (M/M), play some campaigns and after that decide if there is a misbalance in EB or if there is not. As long as you use some houserules to not exploit the AI stupidity (both on the strategical and on the tactical screen), you'll should come up with the sollution that EB itself is well balanced.
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BTW, you have again nearly no medium infantry in your amry.
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