Ralph, whether it is only the phonostage that needs loading or also the
cartridge is debatable. The general terminology is "cartridge loading".
So adding resistors to primary should load and damp the cartridge.
Actually, regarding whether its the cartridge or the phonostage, there is no debate at all. Its just physics.
I know this as at one time I also thought low output moving coil cartridges needed loading, and to take the mystery out of the process, I began researching a device that could sort out the right value.
What I found was that it was not the cartridge that the loading was affecting. Instead the loading affects the Q of the resonance caused by the inductance of the cartridge and the capacitance of the cable. Reduce the Q enough (with proper loading) and the resonant circuit can't oscillate.
With SUTs, you don't get the same issues, mostly because the SUT can't pass the Radio Frequencies (RF) that are typically generated. But the SUT is an inductive device and does ring if improperly loaded.
LOMCs are inductive too of course, but they don't ring at audio frequencies (quite unlike MM cartridges BTW). I was a bit incredulous at first but you can 'ring' a LOMC cartridge with a square wave and its very good at passing it right through. IOW they don't ring at audio frequencies!
I also prefer a high gain MC stage as well. If executed properly they are more transparent than using a transformer.