My recommendation: If you plan to mod the units in the game, don't bother with the difficulty level. Hard and Very hard apparantly only add combat bonuses (no tactical changes), and if you're going to mod, why add an unnecessary variable? (the difficulty modifier). I recommend playing modded games on Medium difficulty.
However, if you're trying to change only one or two units, that's a different story. Then you can control just the unit in question, and tune that change to the difficulty level you play at. If you like Very Hard's combat bonuses, but don't want to change every unit to mod that same bonus in, then leave the game at Very Hard, and mod "down" the unit in question. Keep in mind that if you do choose to play at a lower difficulty level, your "tuning" will make the unit unusually weak at more sane difficulty levels.
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