You might want to use Archbishop Hilarion’s The Mystery of Faith. An Introduction to the Teaching and Spirituality of the Orthodox Church (Darton, Longman and Todd, 2002) to compare with your the Catechism of the Catholic Church. His is the best summary of the Church teachings in English.
Vladimir Sergeyevich Solovyov was not Orthodox in theology. He teachs Sophia. I do not think it is Roman Catholic. However you best judge that by reading his encounters with Sophia in his works the Three Encounters and Lectures on Godmanhood.
The one book of his excerpted in English you listed might please you. However, his teaching on Sophia have been deemed a heresy by the Orthodox. An educated Orthodox will not listen to you use his works. If you were to reference his works in a talk with me, I think you also believe in his Sophia heresy and you would get no where with me. He might defend the Roman Catholic stands, but you do not want to be associated with his Sophia heresy?
I suggest you read Solovyov with the same care you would read Nestorius’ Bazaar of Heracleides. You might get some good things from Nestorius’ work, but would you use it with a non Roman Catholic? You might try, but a person might think you are Nestorius’ follower.
Use Solovyov if you want, but if I think you are a follower of his teachings do not expect me to listen. I do not listen to Nestorius nor will I listen to Solovyov. One because he rejected the two natures in Christ. One because he teaches Sophia.
It is best to use your Roman Catholic authors and not rely on Solovyov. However you are free to do as you wish.