Trying to find the gain specs for your phono stage, with no joy thus far.
The following review does mention that your M1 has less than the 60dB I brought up and possible problems, with LOMCs (carts of <1 mV output):
ttps://www.remusic.it/EN/Musical-Fidelity-M1-ViNL-phono-preamp-b5abd500
Can’t swear to anything, but: that’s the first place I’d look, for a solution.