I think you said 350 hours a year? If so, that is my dream job. Not everyone wants 900 to 1,000 hours a year, despite the pay. It wears you out, makes you hate coming to work.

Our new "contract" bumped the monthly maximum up significantly, and I am dreading it.

If you could increase 350 to 500 to 600 hours annually, that would be about 45 hours a month, which is still very gentle on the body and the mind. It sounds like you are in a good place. I'd be very careful about abandoning a job you enjoy for a high-time grind.