Hi @quicky06,
I remember the other thread so I suppose you already actually measured the continuity values between the different parts you grounded ?
@LiamN has a great thread and video going over the subtleties of grounding, which boils down to star-grounding everything (as @runnin8 mentioned) but also hunting down the areas where you can actually get a good electrical contact for those ground wires, which is not everywhere, and may not even be exactly the same between different machines.