Perfect and reasonable order/sequence of steps
Regarding "6.- Faraday Cage add Aluminum foil to the enclosure", you may tack some household aluminum foil to a large enough cardboard and place it on the chassis (making sure it makes contact) to test its effect outside the cabinet.
The additional shielding may actually reduce oscillation and unwanted coupling issues, so also check with scope at SPK OUT.
Regarding "6.- Faraday Cage add Aluminum foil to the enclosure", you may tack some household aluminum foil to a large enough cardboard and place it on the chassis (making sure it makes contact) to test its effect outside the cabinet.
The additional shielding may actually reduce oscillation and unwanted coupling issues, so also check with scope at SPK OUT.
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