When in doubt, reference. My advice would be to check out the finals of other maps to see if you can't figure out a more appropriate way to texture your final, especially the ceiling. relavent maps that come to mind: Well Hydro Badlands (industrial rather than spytech, but check out the ceiling and supports). The textures you're using look like arse when fully lit because they're not supposed to be used on such large pieces of geometry and in such an abundance. They're more for trims (window frames) and trusses.