Is the front bracket moving? Is it possible to show a video of the rails off the bracket and moving it up and down? It could be that the bracket isn't torqued correctly or the rails might also be loose. My guess would be the brackets. Maybe the first 2? I would also check the first flag nut and...
Overall it sounds like you had small issues with them like the wait time for the rails you mentioned and rear bumper. Things like this are sort of common (Not gonna say any company names because I'm not the type to lash out and try to ruin a company but one company that also had a wait is...