Style and genre aside, the picker in the video suffers from playing in quiet rooms. Listen to the OPs namesake Blind Arthur Blake for how to dig in and make the guitar belt it out.
I recommend playing in all sorts of settings, my favorite being outside on a coffee shop patio with a fair amount of traffic for white noise, sort of "isometrics for the hands/ears". When you can project while maintaining relaxed hands you'll get the full potential from that dear little wooden box you own.
The player in the video is missing 70-80% of the sound of which the box is capable. It's not just sheer volume...it's the zen of projecting the voice of the instrument. This is not easily developed in quiet environs. It can be done, but having to project through other sound will be the quicker route.
http://youtu.be/_eB-rXSnno8