Right... I remember my original Shure M94E from around early 2000s, it was a good performer but unfortunately I was never able to find the original (genuine) replacement so eventually I put it up for sale.
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As for the conical M91, I picked up the cheapest Swiss generic replacement for around 30€ and decided to "gamble". Which to be honest really paid off, as I'm successfully tracking that same 91GD at 1.25g even on a heavier S-shaped tonearm, not necessarily suitable for highly compliant Shure. And it really tracks surprisingly good, even on certain points where the grooves are chewed up (damaged in any way) & Audio Technica VM series tend to skip.
I was also genuinely surprised to realize that unlike AT, Shure does not seem to be as resonant. Because there are one or two albums (Moody Blues, A Question of Balance in particular) which really bring out the resonance on the VM series ... Micro-Linear cuts in particular. Where on the other hand Shure went right across the entire side with no resonance, whatsoever. Only goes to show that there are pros and cons for everything *shrug*
50pF?!? As far as I know, that's next to impossible ... even on extremely high-end gear.
Edit
Figured I'd explain more about this particular subject... When I first bought VM carts, I obviously had a loading issue because most of them (530 EN in particular) were just too bright. Shrill-sounding, it REALLY did NOT sound pleasing in any way. But ever since I moved on to PreII my experience with the VM series changed for the better.
Yes, I can hear the audible difference and it really sounds more balanced, dynamic if you wish. Though I still prefer the sound of Micro-Linear 540 and 740 carts, compared to more lacking 510 and 530 which is why 530 usually just "hangs out" on a stand-by, where 540 does all the work. All I'm saying is that Audio Technica carts seem to exhibit more surface noise, regardless of their overall size and cut. And not just the VM series ... I could easily say the same for VM95E, AT-XP3, AT-95EX, AT3600L and just about every other AT cartridge that I have & tried. Which is not necessarily a bad thing, but certainly something to keep in mind, whenever I want to keep the background completely "black", without any noise, surface clicks, pops or hisses.