not nice at all. Serpent tome and CC is a bad combo due to serpent tome effect. I suggest you to swap either his tome for owl tome or a slot skill for something better.
Or I can keep using him as a counter-focused mix tank that can counter everything and gains a bonus 6 DEF/RES (for an effective 35 at +10) when countering anything.
(The Serpent Tome's effect is exactly why I gave him Close DEF and Close Counter.)