You can only level it up by using it. So it's always best to level your professions while you are leveling. Then you won't have to go back to earlier planets.
600 for a helm, n 600 for the Overloaded, Charged Interrogaters sets, 600 for the Galvanized n Engerized sets too would hate to see the costs for Visas n Marka's
An why no more Upper, Lower & Aux crates you seem to just be getting lazy!