The moment I read the notification I was like wtf, I think the talk of the winter had me convinced that is one of your trucks - regardless of the cite at the bottom 🙈
I would not want to be in your position now, by the sound of it yes you have a great job but they don't want to give you the security and instead that money on newbies which makes no sense. I don't get how they can't just think logically for one second.
If you do get another job it seems those corps might pay more but will surely have you doing more hours also which this far in your career is something you just don't need.
I can only say best of luck, and maybe you get the security or a better job with reasonable ours even if it is a few more.