[Sanguinarius]

The only advice I can give you is that if you want him to do more damage in close combat you shouldn't have put any point into wizardry until you had your close combat and dual weapons maxed as well, they make quite a difference to samurai's close combat, with the Strength vitality dexterity and speed are the main characteristics for your samurai's close combat, intelligence is only for his wizardry. You've done right ignoring senses for his close combat, it makes little if no difference at all for samarai's. With the attributes you've mentioned maxed and these maxed (critical strike and sword) as well as close combat and dual weapons maxed my samarai is now getting lightning strikes more often and often doing over 100 damage with his lightning strike attack. Its all a matter of whether your samurai is one of your front line troops or your using him to cover he flanks as to whether you put any points at all into wizardry unless you have nothing else to do with those points in the way of improving your samurais close combat.