So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2

most likely this TT/Phone inputs w/o a grounding wire between them, so it is sensitive to 33 1/3 electro-magnetic  radiation.

your statement:

Wiring for the tonearm to the preamp was as follows:

• Pin 1- no connection
• Pin 2- + positive
• Pin 3- - negative
• Shell ground- cable shield

is very very confusing.

This tonearm is for custom mono cartridge? For stereo cartridges, 4 color coded pins (same four pins from arm) are:

positive 1

negative 1

positive 2

negative 2

There is no ground pin for cartridge.

My experience is that ground loop hum/electro-magnetic noise has nothing to do with RCA or XLR plugs if ground wire was connected properly.

remember, Tesla proved a long long time ago that electro-magnetic energy could be transform from source (turn table/cartridge) to receiver (phono stage inputs) if no ground shelling to short the energy.

Actually, this phenomenon states a fundamental fact:  electro-magnetic energy broadcasting as waves/Strings not as particles. So the great Einstein could be wrong right here. 

sound like your cartridge/arm wiring is specific for SE output.

the correct wiring for balanced wiring supposely take (+) and (-) pins to pin 2 and ping 3 in XLR connector. if you want to use external grounding wire between TT and phono stage, leave TT side pin 1 of XLR connector idle (floating). Otherwise, connect TT ground to pin1 of the XLR connectors. 

Above balanced wiring assumes that on Phono stage side the pin 2/3 is connection to positive/negative side of balanced input (such as step up transformer primary), would not work for SE inputs (negative grounded).