High Compliance Cartridge With Low/Med Mass Tone Arm

What Raul said was also my point. The manufacturer of the cartridge may publish a single data point for compliance. That does not guarantee that every single one of those cartridges is exactly the same as to compliance. Likewise, there are a lot of independent variables that affect effective mass, like the weight of the screws and nuts you use, the weight of the headshell, and I personally am never sure what the manufacturer of the tonearm means when he quotes effective mass for his tonearm, because he cannot know what cartridge is to be mounted or account for headshell substitutions, or for the fact that the distance of the center of mass of the counterweight from the pivot, needed to apply correct VTF also has a large effect on effective mass, etc. I use those published numbers as a very rough guide only. Plus, I have grossly violated the rules governing resonant frequency without problems, though I try not to these days.

7Hz is very close to the generally accepted range, 8 to 12Hz. Given the fact that you really don’t know the exact effective mass or the exact compliance of your particular samples, odds are that you are either slightly below the accepted  range or slightly within the excepted range. I would absolutely pay no attention to this issue. Just listen to music. You’re almost certain to be fine.