I use similar armor of protection that you use, and using the speedbonus to your advantage it is possible to reduce the incoming damage with the help of armor. So Ironflesh might be a good choice. It would be my suggestion to you.
3 PS might be useful, but not really advisable as you don't want to reach level 35 to complete it to 6 PS. With that melee wpf though, you probably won't be able to swing it effectively. With 0 athletics and low wpf, most viable option is right swing anyway (with 1handers), considering you're fighting in ground. Although it might be fun and somehow effective if you know when to use your sword on horseback. Still, your wpf is way too low to handle good horseback weapons.
3 Athletics might still be good, some foot archers have only 3-5 athletics (despite higher AGI). Although you know, HA skill reduces the effective wpf so a Horse Archer never has the chance to be equally good as a foot archer anyways.