It is normal for some glazes to change on a refire especially when you are approaching the softening point (I do not mean melting point) of the glaze. This is the point where the fluxes start to be active. This has become very obvious when running the laser decal classes and searching for the softening point for the decal to adhere. There is a fine line where the glaze doesn't react and this is at the lower end of the temp scale. I would hazard a guess that your glaze has a flux that has a very wide firing range and it is perhaps Gerstly Borate. You seem to have reached a point at cone 06 in your glaze where the glaze is already outgassing and the cooling at 06 halts the process and and traps the gases changing both the colour and the integrity of the glaze.
To resurrect this glaze AND burn off the lustre find a cool spot in your glaze firing and take back up to top temp. This should restore the glaze. I say cool spot as refiring is almost like going a cone higher than the original firing.
I would have attempted to save the gold and platinum surfaces by adding a couple more layers (with firings in between) and firing to your gold firing temperature before I took the drastic step of burning the lustre off. To remove small areas of lustre it is common to use a gold eraser but it has to be used carefully as you can "matte" the surface of the glaze that you are rubbing. Lustre can also be removed by using hydrofluoric acid but I personally wouldn't go down that path for H&S reasons. It also mattes the surface of the glaze where the lustre has been removed.