Just looking through a few of your images and there are a few areas which will need some more sanding, perhaps filling too. With Phasma the base needs to be as flat as you can get it as every blemish will show in the final stage.
When sanding filler you can wrap sandpaper around a small block of wood, helps to sand flat raised areas or you can purchase a rubbing block from an automotive store
Once your armor is finished and you have sprayed a few coats of spray putty or primer/filler you can then give a light mist spray with black, this helps when wet sanding (or dry sanding) to show high and low areas, any areas with black remaining will need more filling.
https://www.renownauto.com/blog/entry/what-is-a-guide-coat
A couple of videos on guide coat and block sanding