The body on the faded SG special was cut two different ways.
One was more traditionally routed for the pickups, with a long hole that extends from the pickup to control cavities. The newer ones have an enlarged bridge pickup route, and a top routed channel that allows a shorter hole from that channel to the control cavity. There are some anecdotal reports of feedback with those.
The fix - is to take some weather strip, and place it under the pickup to dampen it from excess vibration. If you're good, you can place the weather strip material so the pickups will angle slightly and be more parallel to the strings as well.
That should fix it.