At the risk of sounding like a dork I will just go ahead and tell you that I wear butt and thigh pads, knee guards, elbow and wrist guards, and spinal protection every time i'm trying something new. (oh yeh and a helmet)
At first I felt like such a dork wearing all that crap but it's really saved me. Especially trying to throw much bigger moves with corks.
Long story short I'd recommend wrist guards as well as everything else I just mentioned
How do you like the back protector??? I'm not doing nearly what you do, but I have thought about it. I don't think I have hit where it would help but not sure.
Since I want to learn boardslides on a rail I thought this would be a good piece of equipment. Especially if I go down back 1st on the rail.