Nicolas, I think everything you are doing for good soil health is working. Leaves, straw and manure will bring and keep the worms. If you have worms, your soil is providing what your plants need.
I also heat with wood, mostly oak, ash and hickory seasoned for 2 years. All the ash from the burner goes on the garden, stock tanks and other containers. Also the ash is mixed into the compost piles. After decades of using ash my plants tell me they like it.
By all means do a soil test if you are unsure, but I think your soil structure is in good shape. A soil test will tell you where you're at before adding ash. I think after a couple years of using ash and then do a test you would find little if any change. Soils tend to find the right balance as long as you continue using leaves and manure.
I hope this translates for you.
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