VD and Airlink do the same thing, you don’t use the two of them in tandem. I prefer VD because it’s a lot more versatile and has tons of options.
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Install VD both in the PC (you already have it) and in the Quest 3 (available through the store).
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With VD open in the PC, launch it from the Quest 3 as well. Follow the instructions on the headset (I don’t quite remember them but it’s simple, it’s a login process with a password that you do only once). That should start the streaming process from the PC to the Headset.
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Once you are seeing your PC desktop inside your headset, launch SteamVR from VD’s side menu (or you can also just launch Heresphere directly from VD if it shows up in the “games” tab. I prefer the first method despite being one extra step though, but there’s no need to explain why for now, it’s not a big deal anyways).
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Launch Heresphere from the SteamVR environment if you didn’t do it directly from VD in the previous step.
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Once you are in Heresphere, and assuming you already have XBVR properly set up (I understand you already know how to do this), enter into the Heresphere kind of library interface by pressing the play button up top and then you are golden.
Tweak bitrate, refresh rate, overall quality and other settings directly from VD’s options or mix them at the same time with Heresphere’s own settings to get an image quality that satisfies you.