Already seen it in the other thread. Looking good.
Silvering is caused by air bubbles underneath the decal, which is why it is preferred the surface to apply decal is gloss coated. Decal softener/set helps as the help decals conform to the surface by partially dissolving the decal film. The film typically has a different finish than the paint so for decal film to really disappear, you'd have to gloss coat everything, which brings other surface up to the decal's glossiness, sand flat, gloss coat again then flat coat to the desired level. A lot of work. I also find gundam decals typically thicker than the good quality decals produced for scale models (eg by Cartograph) making it hard to bring level.