I've had the Moon North on Focal beryllium (Kanta, Sopra, and Utopia) and it's a great match. The Moon is never harsh and everything is controlled well. Warmer than I expected. I have not tried your pre. I've only run with Moon North 891.
My friends that don't like Focal beryllium were not run out of the room with only two setups: the Moon North, and Classe Delta power/pre. Everything is smooth and well balanced and never offensive.