Adding and removing disks from Windows Server 2012 R2 storage spaces

Hello TechNet.
I am fairly new to WS coming from a background with linux, so please forgive me if I have missed something obvious.

I have Windows Server 2012 R2 Standard set-up with two virtual machines, one for exchange (WS 2012) and one for AD and DS (WS 2012 R2). The physical machine does only handle the VM's and aStorage Pool(split into two virtual thin mirror disks).

The Storage Pool is JBOD with two 128GB SSD andthree 1TB+ disks and two smaller, random disks (see below). I noticed that I couldn't move files to the VD(due to no free space) and saw usage on the VD being around 128GBI presume this was related to the 128GB SSD.
Also the GUI reported both warning and degraded on the virtual disks.

I retired both SSD's via PowerShell and tried repair before (and after) adding a 1.5TB HDD to the pool. Repair didn't seem to work so I added a 2TB HDDand tried it again.
This time one SSD reported being usage at close to zero. I tried to use remove commands via both Power Shell and GUI since I presume the disk is no longer in use. This generated error about the disk being in use.
I went on stopping the VM's and de-attached the virtual disks and tried again to no avail.

This lead me to power off the server and remove the disk. I started up and made sure everything was working correctly.Except for warnings, everything seemed fine. I powered off the server again and added another2TB HDD in the slot of the old SSD.

I still cant use more space nor does the repair command work (tested both PowerShell and GUI). I read that sometimes windows fixes problems like this over time so I let it rest over the weekend. This made no difference and my problems are still the same.

Server manager reports available space at 8.4TB, Free space at 7.75TB and with both VD's degraded and a allocated use of190GB and 132GB.
My current status looks like this:

FriendlyName        CanPool             OperationalStatus   HealthStatus        Usage                              Size
------------        -------             -----------------   ------------        -----                              ----
PhysicalDisk-1      False               Lost Communication Warning  Retired                         111 GB
PhysicalDisk1       False               OK                  Healthy             Retired                          111 GB
PhysicalDisk5       False               OK                  Healthy             Auto-Select                    221.2 GB
PhysicalDisk3       False               OK                  Healthy             Auto-Select                   464.75 GB
PhysicalDisk2       False               OK                  Healthy             Auto-Select                   930.75 GB
PhysicalDisk4       False               OK                  Healthy             Auto-Select                   930.75 GB
PhysicalDisk6       False               OK                  Healthy             Auto-Select                   930.75 GB
PhysicalDisk0       False               OK                  Healthy             Auto-Select                     1.36 TB
PhysicalDisk7       False               OK                  Healthy             Auto-Select                     1.82 TB
PhysicalDisk10     False               OK                  Healthy             Auto-Select                     1.82 TB

What options do I have to resolve this and/or what did I do wrong?