I've played against VC several times now and what I have found out (trial and error) that you need to hit their army all at once, ie don't concentrate on one unit at a time. The first game I played against VC I made this mistake and got my behind handed to me, the second game I attacked five of his units during my turn (magic, shooting, combat etc..) This prevented him from just using his magic phase and bring back his army as he lost too many and I just grinded him down from turn 2 onwards.
What I'm saying in a long about way is have you considered not getting another hero and using the points to get couple of more units, say 2 units of 10 skinks skirmishers.
Besides you have the cold blood rule and with your Slann/BSB nearby your units are nigh on unbreakable.
Just my two cents worth of opinions.