Shure V15 III loading experiences

I haven't used them in years, still have one in a drawer. As I remember the main loading problem was insufficient loading by most cables.Two hundred to three hundred extra Pf usually smoothed them out considerably. Check Vinyl Engine for info if you haven't already.

Thank you but data is no problem. Personal listening experiences are what I'm reaching for.

FWIW, I'm building a phono pre and putting in parts orders for caps,resistors, etc.

Then the answer is that the problem is capacitance, not impedance. When it is not sufficient you have a droop in the midrange.

If my memory serves, I think the commonly agreed upon loading is 47K and
220pf. But the last time I use one was almost 30 years ago so I could be wrong.
Someone please confirm.