Collective bargaining is usually around work rules and core issues. No non-VP+ individual has the ability to effectively bargain re health insurance.
All companies have pay scales. Even massive unionized bureaucracies like the Federal government have the ability to compensate critical employees or critical skills. (Although your definition of critical may not align with the entity)
If you changed companies though you started at the bottom, guaranteed, because if you get moved ahead of people in the new company it creates an utter shitstorm. Management at the new job basically has to hate their employees and themselves to do such a thing.
No. You're going to get what the union wants.
People complain endlessly about HOAs and their behavior. Being in a union is the same shit!
By the way, in my professional adult life, there has never been a situation where there was something reasonable that I wanted in my employment contract and didn't get it. Just ask! I wonder how many people out there want unions and are also the kinds of people who don't ask for things they need.
And if you want to use unions to get you things that are _unreasonable_ that's bad for everyone.
That means you can't go to your bosses and say "I think I'm worth this much (more) money".
You also can't leave your job to get paid that much, because seniority at your new company means you will start at lower pay than you currently have.