Low mass / 47Labs Stratos IC plugs not working with new setup

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I've been using 47Labs Stratos cables and plugs as interconnects for ages, without issues, but now I've run into problems.
I'm experimenting with a new low-budget setup, consisting of an old MacBook Pro and a cheap old DVD players as sources; which are connected to a Topping E30II DAC (also testing a Smsl C100), and then connected to a Fosi V3 amp.
When I use the 47Labs Stratos cables and plugs as interconnects between the DVD player and DACs, and between the DAC and the amp, they sometimes work for a little while, sometimes they don't work at all.
I have several of the Stratos interconnects, re-wired and cleaned them etc., yet the issue persists with all of them.

Now if I use a cheap RCA connector, and for testing assemble them in a very shady way, it always works. (images #1)
Even if I only use the center pin, and the Stratos ground plug, it does work too. (images #2).

Any ideas what the root cause of it may be?
A weak signal from the new DACs perhaps, too little contact surface, the mass of the center pin?
I'll try to attach the images in following postings, not sure how else I can do it here; sorry about the mess.
Warning: terrible craftsmanship, used for testing purposes only.

Edits: 10/02/23

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Parts Connexion

Topic - Low mass / 47Labs Stratos IC plugs not working with new setup - horst 09:29:04 10/02/23 (14)

What is this, S/PDIF? - Fluter 20:10:23 10/03/23 (8)

RE: What is this, S/PDIF? - horst 23:36:02 10/03/23 (7)

Measured? - Fluter 05:42:13 10/04/23 (6)

RE: Measured? - horst 06:37:44 10/04/23 (5)

Insertion depth - Fluter 07:31:55 10/04/23 (4)

RE: Insertion depth - horst 08:14:43 10/04/23 (3)

Insulation - Fluter 09:13:28 10/04/23 (2)

depth - horst 04:05:44 10/05/23 (1)

RE: depth - Fluter 07:20:48 10/05/23 (0)

Image original - horst 09:30:09 10/02/23 (4)

Image 1 - horst 09:31:14 10/02/23 (3)

Image 1a - horst 09:31:50 10/02/23 (2)

Image 2 - horst 09:32:58 10/02/23 (1)

Image 2a - horst 09:33:36 10/02/23 (0)

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