I think your stats are down, alough you could add substats for each major stat.
Victory = fighting skill, magic skill, other circumstances (terrain, etc). All three add up to the main victory percentage, or add bonuses to the base percentage.
Character equipment gives bonuses to victory, +5 sword/shield gives +5% vic or something.
As characters level up, they get access to feats. Bonuses to vic, syn, end and hp etc. chances to find additional items after adventure. You get the idea.
Equiptment/artifacts have effects attached to them. Much like feats only you have to equip weapon/armor or have artifact in possession.
I know im just reeling off generic game ideas but this is the kind of stuff that will work.