Please don't throw two dice on a single revision. It wastes a die. It would be far better to spproach the problem from two sides (Ie, 1 making itshana cheaper, the others getting extra Ore).
Anyway : Proposals
Advanced Fuses : Current fuses are primitive and cost much time to replace. The advanced fuse uses a spring and a fragment of a broken lift crystal, both very cheap and abundant materials. When power flows through the fuse, the crystal fragment activates and pulls against the spring. The maximum flow can thus be chosen by adjusting the tension on the spring.
Bored Dragun : The Dragun is promising, but very expensive. In order to resolve this, we have revised it's construction methods. By boring rather than casting the gun, we can tighten manufacturing tolerances and lower the chance of explosive failures. This results in significant materials saving and lowered costs.
Carcass shot : The Dragun's incendiary projectiles lack range compared to it's leaden projectile. The Carcass shot is the answer. It consists of a hollow bronze shell within which a sulfur and gunpowder mixture is contained. Holes within the casing allowing the burning stuff to leak out and spray as the projectile flies to it's destination.
Layered Copper Armor : Our copper armor is currently a single massive block. The layered armor consists instead of many seperate thinner plates with gaps in between them to allow the transfer of heat to the air. Small openings in the front and back allow air to travel freely between plates to aid in this heat exchange.
Tactic : Covering Fire
Advances and retreats will be made by dividing soldiers and artillery in two groups. One who continues the advance, the other who opens fire to supress the enemy. Thus, we can ensure that any wannabe ambushes will always face a PLACE blast.