You have to looks for the cartridge dynamic compliance, but not at the compliance measured at 100Hz (like everything from Japanese cartridge manufacturers). You need at compliance figure measured at 10Hz to make correct calculation !!!
I can’t find that information in the manual from Sumiko
So i have no ideal was it 15 cu @ 100Hz ... or 15 cu @ 10Hz ?
If it was 15 cu @ 100Hz you have to convert it to 10Hz first !
15 cu x 1.7 = 25.5 cu @ 10Hz
25 cu is NOT a low compliance, but a medium-high compliance.
Posters above told you it’s a low compliance, but do they know for sure was it 15cu @ 10 Hz to say so ???
Or it was 15cu @ 100 Hz which makes all your calculation wrong.
To make all the calculation after you will be able to confirm a compliance figure go here on Ortofon website and read this
And yes, Hi-Fi Test Record is a great tool to measure the actual resonance of your arm/cart combination in realtime.