I really don't understand what you are trying to do. You have told us some observations you have made but there are not enough details to answer, "What's going on?"
For example I see the HS drive was created recently, how did you do that?
I was running high sierra from booted from the USB attached SSD. I was trying to run a speed test on the start up drive and it would not run because of permissions. There was no way I could find to change the permissions on the start up drive. I kept getting the above message. What I did was restart the Mac from another startup drive, and then I changed the permissions on the High Sierra SSD startup drive.
I was running high sierra from booted from the USB attached SSD. I was trying to run a speed test on the start up drive and it would not run because of permissions.
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