Giving the car a mild polish might not be a bad idea if it's not been done before. Then build on that with the Step #2 and the NXT and see how it looks. If your still not impressed then maybe think about changing the Step #2 and the NXT for something different.

Also, are you trying to achieve a 'look'? Either a wet look finish or a highly reflective finish? Silver is a colour where you achieve wet and reflective look quite easily but, a deep gloss won't be quite as easy to get as it would be on a darker colour. If you want highly reflective, then go for a sealant (synthetic wax) as generally these give a brighter finish than a carnauba wax (Your NXT is a sealant but, is more of an all rounder on looks than something a bit more specialised like the Four Star, Prima, Duragloss or even my own brand sealant)......A carnauba based wax will give you the wetter, deeper shine but, sometimes carnauba waxes can mute metallic flake slightly if you go for a deeper finishing wax.

Below are a few pics of my brothers Moonstone Fiesta which was washed with my own brand shampoo, Paint Cleanser and Polymer Sealant..... I like the highly reflective finish on light and metalic colours so thats what I went for.......






Cheers.