That's how the cookie crumbles.
Unless you pay to fill the volume of an entire furnace at specific temperature.
You don't get to select highly specific austenitizing temperatures. The furnaces are always running full time at a specific range of temperatures for never ending mountains of work from all across the country.
It's the heat treaters discression to select what range your pieces will fill in and what the openings are. They do have a lot of experience.
You can select if you want a cryo and what HRC you would like them to temper to.
If you wanna nerd out on HT and maximize the steels potential you'll have to set up your own operation and drop a serious investment in the proper tools.
Everybody has to start somewhere, I started with Peter's and was eventually able to fund my own heat treatment equipment piece by piece in what felt like an eternity.
Peter's has limitations but I appreciated everything Brad Stallsmith did when he could.