Help me improve a Dwarf/Empire Deck

By SeanXor, in Warhammer Invasion Deck Building

I am looking forward to playing in the Gen-Con league. However, the only decks I have ever played against are my wife, using decks I have made. So before I play others, I was really hoping to get some insights on how to best improve one of the decks I am thinking about playing with. I am between this one and a Dark Elf deck (which I will post next)

This split race deck is all about battlefield developments and lots of damage. It does have a really good combo in Troll Slayers-Hellblaster Volley Guns-City Gates. However, I have found that if Troll Slayers or the gun are not in the starting hand or intial draws it can stall some. Since it might be helpful for you to know, to work with I have 2 copies of the base set, 1 copy of assault on Ulthuan, and 1 copy of every battle pack except Arcane fire and The Burrning of Derricksburg. I look forward to what suggestions you might have. Thanks :)

Units
Troll Slayers x3
Defender of the Hold x3
Wilhelm of the Osterknacht x2
Reiksguard Knights x3
Pistoliers x3
Warrior Priests x3
Dwarven Cannon Crew x2
Dwarf Miner x3
Dragon Slayer x3

Support
City Gates x2
Contested Fortress x3
Dwarf-Empire Alliance x2
Keystone Forge x3
Shrine to Taal x2
Helblaster Volley Gun x3

Tactics
Master Rune of Valaya x2
Wake the Mountain x2
Demoralise x3
Burn it down x2
Surprise Assault x1

Total=50

I would consider Demolition, for a cheap and flexible way of taking out crucial supports.