I think that's part of the problem which I didn't catch earlier.
You're using a 34z which is a homeowner grade mower and you're expecting it to perform commercial quality work. It's just not going to happen. It is a light duty machine period.
At 700 hours if a homeowner used their mower 1 hr/cut and cuts 6 months out of the year, that's 29 years of homeowner use on that mower.
You're not upsetting me or anyone else who supports Gravely. A legitimate gripe I have no issues with. I still think your expectations are misaligned with what that machine is rated for.