After a long time, decided to update the PCB of the LL1943 SUT to provide extra flexibility on the grounding connection. This is in essence to ensure no ground loops and noise when either using balanced or un-balanced cabling from the cartridge into the PCB:
The additional jumpers are in line with the recommendations from the Datasheet. Here is the diagram:
For a fixed connection (like in most of the cases once preamp has been tuned/optimised) you can replace the jumpers by solid core wire jumpers soldered to the pad for best connection and performance.
I made a small batch (I won’t need more than 2 or 4! myself) so the remaining will go on first-come-first-serve basis.