A few thoughts:
Athenian Long Wall tech — making it available in Phase 2, cheaper and faster to research—sounds like a smart move. It'd finally make early walling a real strategic option instead of something you barely get to use.
Gymnasium cost — bumping it to 150 stone + 150 metal makes sense if it's not meant to be an actual civ bonus. Feels more balanced compared to other civ structures.
Briton Dogs — lowering hack damage to 6.5 and adding an armor upgrade in P2/P3 sounds fair. Dogs can be oppressive if left unchecked.
Carthaginian Colonization Tech — switching to a wood + stone cost and moving it to Phase 2 would definitely make it more viable. I rarely see it used now given the metal hit via
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