I recently installed a set of Tru Glo TFO night sights on my G19. The screw securing the front sight is tightened as much as it can be without the risk of either breaking or stripping it. The rear 2/3 of the sight blade does not make full contact with the slide surface. I've read the installation instructions twice and have done everything correctly. I am thinking I might have just received a warped set. Any thoughts? I watched a guy on Youtube (after my effort) installing TFOs on his G41; he experienced the same problem. No resolution in his case.