2000 psi and 12lb spring sounds like you have wayyy too much hammer tension/strike too me... but I am certainly NOT an expert here. Possibly even a sticky hammer (?).Did you polish the inside of the tube when you had it apart ?Deburr the inside edges ?Did you use some sort of grease on or around the hammer ? ( it shouldn't need much, if any). I would contact Travis and ask him what he would recommend as a tension setting.