I've read the same CS Lewis as you it seems. Screwtape, Out of the Silent Planet, Mere Christianity.
Did you read Chronicles of Nardia and God in the Dock?
Still have my Chronicles of Narnia series.
Evebn after having to reclaim them and hide them since some helpful person lost one or two of the series on me.
God in the Dock I don't have.
That one has proved elusive for the time being.
Probably because I'm not looking in the right places.