I've just had my first match with my brand new Dwarf team and managed to pull off a 1:0 win against a TV156 Orc team

Now the tough question: A slayer skilled up and I rolled a 6+4

I'm really torn about what to pick from the following options:
+AV: Slayers are the best player on the team and "only" have AV8. They are key targets and an AV9 would help a lot to keep him alive and on the pitch,
+MA: Slayers blitz a lot and with Frenzy they HAVE to GFI. MA6 would make them more mobile and can help avoiding GFIs.
Mighty Blow: if I had rolled a normal skill, MB would have been the definite choice. It helps the Slayer doing what he does best and that's hurting people. And with less opponents on the field the whole team performs better.
So please help me and give me your opinion on what to take

Thanks a lot in advance

Tante Käthe