Unable to resize LUKS LVM

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Trying to resize my LUKS-encrypted LVM vg and I'm unable to.

i.imgur.com/01c0no1.jpg

As you can see in GParted, I have 100GB of free space next to the LUKS partition, however vgdisplay says that I have no free space remaining, and system-config-lvm reports the same.

i.imgur.com/RUHG2SW.jpg

i.imgur.com/GnFjYUDjjpg

The vg is split into 3 volumes, home, root & swap. I've gone through several guides on this subject and they all hit a brick road around here, when I'm trying to actually resize the individual volumes.

Any help would be appreciated, thanks...