I have a cool gunmetal blue single coil cover that I really like the look of, however it seems that it's made of some material that's greatly affecting the tone of the pickup. it's removing a lot of high end. Ultimately, sound matters most, so I decided I cannot use the pickup cover. However, I thought it worth researching if there was some way to keep it from affecting the magnetic field / sound of the pickup. I've found some info online about de-magnetizing it via a degauser, high heat, or suprisingly, hitting it with a hammer? but does removing it's magnetism even mean it won't affect the magnetic field?