"Heavy" isn't worth the costs

[Fluffysox]

Looks like heavy is a close battle between 4 wits and 3 wits...

A suggestion from me is to make the numbers bigger, so things can get specific.
E.G, everything is multiplied by 2. Soldiers would have 6 hp, cost 4 wits, etc. This means a heavy can do 6 damage and cost 8. But now with this more wide range of numbers, the heavy can be reduced to 7. This, if not multiplied by two, would be 3.5, effectively lowering the cost of heavies.