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Looks good...since your noise abatement procedures seem to give good results...why not go further and do more noise killing...eg

1....the fet heatsink connect it to local circuit ground...(use insulation pads on heatsink if nec essary)

2...Use small Y cap across your injection transformer (ie some MLCC in your case)

3...slow down the gate voltage rise as much as you can get away with. (ie damp the switching of the fet as much as poss).

4...Use more pcb layers so you have a huge unbroken ground plance right under all your smps.

use stitching vias to it all over the board.

5...use a common mode choke at input connections to your smps.

6...use twisted pair cable off to your dummy load...make it power coax connection if poss

7...nice little alu "cups" to go over your switching diode and fet and then connect these to local ground.

8...put the whole smps in a metal container with a y cap from the container to the ground in the smps pcb.

9...etc etc