Phono preamp gain setting

I am using the Moon LP 5.3 with a Soundsmith SMMC-1 moving iron cartridge with 2.12 mV output. I have to turn the volume up quite high on my linestage to get the right volume. I would like to try a higher gain setting than the recommended 40db for MM cartridges but the LP 5.3 user manual recommends against. Would it be harmful to the LP 5.3 to try the 54db gain with Smmc-1? Also would it be harmful to try a different resistance load other than the recommended 47k?
Thanks