Wow. That is low.
I decided to show my sets from my 3 locks:
WoW Armory Alternative - Nameless Armory Profiles.
This one is 149 shadow with decent health and mana. Swap out pants for +9 sp legs, the seal of slyvanas with bboF, and trinket with another sp trinket and you have 171 shadow and just under 1k hp. This one doesn't have agm, but has hat.
WoW Armory Alternative - Nameless Armory Profiles.
This one shows 163 shadow on wowarmory. I have stam ring on just to get a little more hp. Swap that ring back out and shadow goes to 169 in game. This one had agm that I hot swap with sp trinket when agm is down. No fishing hat though.
WoW Armory Alternative - Nameless Armory Profiles.
This one has everything, hat and agm, but I haven't had luck with the 8sp belt yet. Still working on that. This is my newest lock. He has 152 shadow and a good amount of life and survivability. I swap agm and trinket with the 2 sp trinkets when they are down.
Just some examples.