You've posted this question in more than one place. Not recommended practice here at macrumors (or anywhere else, for that matter).
However, looking at the above info, I noticed this:
Seems to me that "MS DOS Fat 32"
should NOT be there.
So... here's what I suggest:
First, print out these instructions and check the steps off as you go.
Do this, and I predict a very high probability of success.
You're going to have to "start over" from scratch, so
HAVE A GOOD BACKUP NEARBY BEFORE YOU GO FURTHER.
Now, power down -- ALL THE WAY OFF.
REBOOT to INTERNET recovery:
Press and HOLD DOWN
Command-OPTION-R
...and KEEP HOLDING THEM DOWN while you press the power on button.
KEEP HOLDING THAT KEY COMBO DOWN.
Are you connected via ethernet?
Then the spinning globe will appear.
Let go of the keys.
If you are connecting via wifi, let go of the key combo when you're asked for your wifi password.
After the internet utilities are loaded, DON'T open the installer just yet.
Open DISK UTILITY.
VERY IMPORTANT STEP:
Go to the "view" menu and choose "show all devices".
Now look at "the list on the left".
You should see one or more listings that represent the X9 drive.
The item "at the top" is the physical drive, and the additional entries below it are the logical partitions/containers ON the drive.
We need to erase THE ENTIRE DRIVE, so click on the top line (again, for the X9, not for the Mac) and then click "erase".
Erase to "APFS, GUID partition format".
When the erase is complete (shouldn't take long), quit disk utility and open the OS installer.
Start clicking through. Make sure you designate the X9 as the "target" for the OS install.
The Mac will reboot several times, and the screen will go dark for a minute or more with no other indication of activity. Be patient.
When done, you should see the initial setup screen (choose your language).
CONNECT YOUR BACKUP DRIVE NOW.
Start clicking through.
When setup assistant asks if you wish to restore from another drive, "point the way" to your backup and give SA time to "digest things".
SA will present you with a list of stuff to migrate.
I suggest you just "migrate it all", and let SA do the job.
When done, you should see your old login screen.
So... log in and look around.
Final things:
Be sure to set the startup disk pref pane so the X9 is the new boot drive.
And... run your speedtests now.
Hopefully, they should be better -- with reads up around 420-430 or so.
Good luck and get back to us.
