LONDON Decca, Tzar DST and similar cartridges

I finally got around to checking out the website of Schiit Audio, the company selling the new products from Mike Moffatt, designer of the initial Theta Digital gear. Mikes focus with Schiit is on very inexpensive offerings, and his $129 phono amp is interesting in that in his description of its design on the website, Mike states that the lowest gain setting (30dB) is for very high output 5mV cartridges, specifically naming the Decca/London. For $129, sure worth a listen! Mike also mentioned that for that price, he couldn't include adjustable loading, no doubt referring to the requirements necessary for getting the optimum performance from the Decca/Londons, which he said could be added after purchase.

I just came across this old thread and as an owner of a London Decca Reference I thought I'd respond.  I've had mine for a couple of years but have always loaded it at 47k.  I was interested to read the suggestion of loading it at 15k.  I'll give that a try.  Thanks.

I spoke to John Wright on the phone and by email, when he rebuilt my FFSS MkIV C4E with a fine line tip. He told me to load it at 33k. hence I had Graham Tricker build me a TRON Seven Reference to match this. GT spoke to JW as well just to check before he built this for me. Great match and sounds fabulous. But just not as good as 1/4 inch 15 IPS master tape, but hey LPs are a lot cheaper :)

That's the cartridge I'm looking for myself, topoxforddoc. I already have a London Super Gold with Decapod and a Reference, but the Decca MkIV C4e has it's own, unique, qualities. Regarding the loading of the Reference, John Wright himself recommends running it at 15k ohms and with about 220 pF of capacitance. That's the only way I've heard it.

I’ve ordered the DB Systems DBP-6 MC Phono Resistor Loading Kit to run the Decca Reference at 15k ohms. And by adding a 130pF cap I can bring the capacitance up to 220pF.
I’m curious:
What sonic differences have others experience when running it at 47k and then at 15k?