This is the key phrase > ...of things that aren't mine Ive been in that situation some years ago and I learnt 2 thing, 1. I mishandled that situation due to

This is the key phrase > ...of things that aren't mine Ive been in that situation some years ago and I learnt 2 thing, 1. I mishandled that situation due to arrogance (it finally sunk in that being right isn't enough!) 2. more importantly, against real entrenched positions, I can't fight a fight for which I have no formal authority, and against people who will actively sabotage me even at the cost of themselves (and they really did damage themselves to block me). It sounds like you're doing a far better job than me in presenting your case, so well done there, but if people are just going to be dicks and you can't get their buy-in, AFAICS and IME you're going to lose. If you can make a case and the other engineers won't take it seriously, raise it up to their manager (and carefully, not in a way that I did which was to annoy my co-workers) whose job it actually is. If boss won't listen, you're stuffed. Swallow it or resign. I'd suggest trying to find why your co-engineers don't see it as you do - you've given (a), (b) and (c), but it would be interesting to for you to get their side - if they're "regularly having to stay late and fix fire drills", well, the very first thing an engineer does it make life easy for themselves, so why is that not happening here?