alright so i was looking through your tabs i realized that no 
one has actually talked about the double thump technique which 
he constantly uses so hear it is:

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What you do is you hit the string with your thumb going down and 
then you place your thumb under the string and bring it back up 
with your thumb and you pop it that way. he uses this in basically 
every song i have ever seen. some times he will hit the sting well 
it is open and hammer onto the fret with the finger and then pop 
it with the thumb again. for example check out his classical 
thump. that is what helped me learn it so check it out.