It sounds much different at 100 ohms tone wise better , but noisy to much gain, so I think maybe 150 to 200 ohms will do. The Hana sl sounds good at 470 ohms the Hana ml sounds to stringent
The SL and ML have similar gain - 0,5mv and 0.4mv respectively, so gain should be the same, The ML is a crisper sounding cartridge, the SL is soft sounding. Although the SL is 30ohms vs the ML 8ohms, what you are hearing is more the cartridge sound than the loading/gain implications, and you might be chasing a rabbit down a hole trying to fix it. Have you rechecked set up including VTA which will need to be more exacting with the ML stylus profile.