Take everything to true ground ( mains) including backbox sheeting etc and you shouldn't have anymore problems. IMO the Clay mods don't go far enough because you can never have too much ground, only not enough
I agree, I don't think Clay's guides have anything about the two separate grounds on the power supply.
I had an issue with mine so I rebuilt it and grounded everything to common, hasn't missed a beat yet.
also don't forget your board connectors, these often get overlooked but are well worth doing.
