Thanks PeraWind. Nice answer! Much appreciated.
Over the next few months I'll be removing sancs, that are useless in Banish, as gems become available.
You know, all this time I thought that HP was Hit Points. But its health, right? My Thucy has a sh*tload of HP and still stuns quite well. I wonder just how powerful it can become with more suitable runes. I suppose its all gonna be a bit of a trade off really. Get the stun as close to 100% as possible and the damage inflicted as high as possible.
So, I assume from what you say, Thucy would be best with as much Skill Attack, Crit, Hit Rating (up to 100% hits), and possibly Physical attack as possible.
I suppose this would be the same for Cianna as well.