I'm sorry that is so frustrating. It seems like everything is so erratic. Have you had problems with USB and interference? Does ADB/MTP work fine on your device and that laptop? If you have a little USB 2.0 hub you can insert that in the path and see if it makes a difference.
Probably needless to say, but don't disconnect the cable at all during this. Try downloading usblog.exe You can just leave that running in the corner and you can see if there are clean transitions from ADB to EDL.
http://www.temblast.com/windows.htm
It's possible that Windows 11 is connecting, then reconnecting. Or connecting and flushing the input. If you have another machine (especially non-11), definitely try that.
I just did about 20 loading the loader in a row on my Poke3 with no problem and no variation at all in response. I just did another dozen using a USB 2.0 connection instead.