I think Reinforced is good as it is (+4, +4). But it's bad compared to the Lordly Stats, meaning that people are not so likely to heirloom light armor, which decreases diversity and increase the amount of Kuyaks.
My solution would be to give Light Armor a different +3 stats, which would be: +4, +4 and -50 gold reduction to upkeep. Alternatively, they could have a weight decrease on +3 making them also a good heirloom option.