Affirmative... using good quality (preferably home-did) compost or earth worm castings, as well consistently building organic matter have been my approach. Incorporating clays/rock dusts (glacial, volcanic) into the soil will also increase CEC... Though I don't have the ability to test CEC, the plants certainly speak for themselves compared to the controls.
Just put the cards in their christmas stocking and PRESTO! They get it now! It's like you're the harry potter of permaculture. richsoil.com/cards