Maybe we are looking at different numbers... And I don't know how you're measuring what I presume is resonance frequency.
vdH does not say Dynamic Compliance for MS - at least from what I've seen - they do give recommended tonearm effective mass for each cart.
I was asking about the MS spec'd effective mass of the cart you're using on the 4P 11". vdH usually gives a range and it is written on the MS box lid - at least for the one's I've seen. Do you have that?
What I did other carts mentioned ...
Given 4P effective mass of 18g and weight of cartridge+screws I was looking at the compliance numbers for the various cartridges, then seeing resonance frequencies at Vinyl Engine calculator. There are other calculators.
https://www.vinylengine.com/cartridge_resonance_evaluator.php?eff_mass=18&submit=Submit
From manufacturer Web sites:
Atlas: 12 x 10-6cm/dyne at 100Hz
Etna sL: 12× 10 cm/dyne at 100 Hz
Opus-1: 8×10-6Cm/Dyne
You'll note on the Vinyl Engine calculator, the Dynamic Compliance in the left side vertical column is stated in terms of 10Hz. ("The resonant frequencies calculated by the evaluator are applicable
only to those measured at 10Hz.") Most Japanese carts give their compliance in terms of 100Hz, so compliance with those numbers are not directly comparable. Unfortunately there is no conversion formula. I've read recommendations to multiply compliances given at 100Hz by 1.5 to 1.75 depending on who is making that suggestion.
So, if that makes sense, at x1.5 Atlas for example, would have compliance around 18 x 10-6cm/dyne. Opus-1 is quite a bit lower than Lyra carts.
But maybe I misunderstand your method. Kindly correct me if so.
Of course actual use will tell the tale better than paper calculation.