Share 'Clay soil that stays clay soil'

I have been gardening in this one spot in my yard for 15 years. Originally it resembled potter's clay (it was potter's clay) I built raised beds and have added compost every spring and fall, mulched, added topsoil, shredded leaf mulch for the winter. It still has the consistency of potter's clay, full of worms but clay nevertheless. It doesn't produce badly, but seed starting (except beans and pe…