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Patch cables, PSU and interference

I'll try to keep it short.

My board is a Rockboard tres 3.1, and I used to attach the PSU and its adapter on a small additional platform called "The Tray" attached on the bottom of the board. On one side of it, I had my DI box, a Radial Stagebug.
This is "the tray":
16727396_800.jpg


Later, I replaced "The Tray" with a larger tray which is a Rockboard baseplate and works as a large, pedalboard-sized tray attached underneath. Here it is:

RBO_BASE_PLATE_5-3_04.jpg
There I attached again my PSU, the power adapter and the DI box. Don't know why but since then my Stagebug started picking up interference. I got strong hum on my signal.
Turns out that it's picking up some interference from my PSU (Cioks 4). It has never done it before!!!! Also, with the new baseplate being larger, I placed the elements even further from each other, and since then troubles started.
No matter what I tried, I had to move the DI box on the top of the board to keep it at safe distance from the PSU.

At first I thought it could be the patch cables, but those were the same ones that were there before. I replaced all of them nevertheless, to no avail.

What puzzles me is that when I used the "Tray" the DI box and the PSU were basically side to side...ever since I moved it away, on the larger baseplate, it started picking up noises, and now if I try to move it closer to the PSU, even back to the original position, it only gets noisier.

Any suggestions? Could it be the baseplate a culprit? But how?