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I am interested in the 4/4 Hirsbrunner style instruments listed above or similar instruments. I have done as much research on here as I can find, but if I missed some I welcome links. I have only found very limited recordings of these instruments. If you have info on these please respond or PM me.

I live in western Canada, and struggle to get access to instruments. So to the people that say try before you buy, I would love to. I don't have access, and I can not afford to go to a trade show.
I have been researching 4/4 and/or 5/4 CC. I didn't not want to make one of those, suggest me an instrument posts. My budget is reasonable. I have tried the Miraphone 186 & 188, I have had an Alex 163 for a while, I used to have a Yamaha 861, I have a YCB 621 copy (for sale), as well as very briefly got to play a PT6(rotary). There is a Getzen G50 and Eastman 632 in town, but things haven't worked out for me to get to play them for more than 5 min. I have played most of the typical school BBb out there. Those are the instruments I have seen.

The HB21 is I think their "Grand Orchestral" 4/4 version. I tried one and found the fundamentals solid but every other note and the low register wonky.

The HB2P is probably one of the best designed tubas ever in my opinion with the best overall sound and response. There's one for sale in Canada by Kory I think.

I've spent some time with the new Packer CC. I love it. Very consistent horn that has a very pretty sound. Very heavy too, and it seems to be built very well. My only concern was that the fifth valve seemed a little "sloppy". Then again, most 5th valves on the horns I've tried have been that way too. I'd put it up there with the Eastman 632. The build quality of the packer did seem better than the Eastman.