Compass offsets too high

Hello everyone.

I would really appreciate some help. I can not get my compass offsets in green it stays in Yellow. figures are more or less 300, 400, 16.

I have the RC timer frame. My autopilot sits on the top plate and the PDB and electrical wires are on the bottom plate.

Only wires that are close to the unit is the wires connected to the ports. I have even moved the GPS mast that has a metalic base to about an inch in front of the autopilot. I have 4 small metal hex nuts and screws that hold the anti vibration plate to the top plate of the drone.

Have you tried putting a small sheet of mu-metal on the bottom of the plate the pixhawk is on? Should reduce any magnetic interference by a good bit.