Hello, great AAR! Good luck and stamina with it!
As to your question: my polybian legion is: 1 velites, 1 accensi, 2 hastati, 2 principes, 1 triarii, 1 general (usually just commands, rarely fights), 1 junior family member as cavalry. This the roman core, which coud be divided in half between the two family members, as "senior" having the velites and triarii (usually the passive part), and "junior" having accensi and no triarii commanded by the youngster to relieve him of his "green" trait.
The allied part has usually 3-5 units of regional troops, for example 2 geamilae liguriae + 1 liguriae epos, or 2 celtic spearmen + 2 celtic archers, or 2 iberi caetrati + 2 milites illergetum + 1 balearic slingers (or gaesamica - iberian javelinners).
Overall I think it is rather ballanced, has the proper "roman" feel and is not too overpowered nor unreasonably weak.
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