Awesome painting! You need a rat catcher right now though.
In 25ss games I tend to go with Hamelin, The Obedient Wretch, a rat catcher and a few rats and one or two kids. Save soulstones for making your enemies insignificant.
With the rat catcher you effectively get a second activation out of your rats, which counterbalances the fact they are slow. You need to run the rats forward then activate the rat catcher and bring him up, slaughter rats as a (0) action and then you get brand new rats via Voracious Rats, ready to be activated. Can be quite speedy that way.