I think a way to make the Gaels more unique, would be to make the light infantry a little faster, like 30 base body armour weight, instead of the current 36. Makes them play a little more like skirmishers, and be able to footwork a little better, to counter their weak armour and melee capabilities.
Then everybody will call them 'Those damned fleetfooted coward potato farmers.'
Of course, I'm sure few in this community would like this idea.