This isn't really an Ernie ball question, but a generic question. I have two of the same guitar and on one the strings feel stiff. They both have tremolos that rest on the body and move one direction. They both have two springs in the cavity that are screwed into the factory drilled distance and stop. The action(bridge) on one is a fraction lower... The necks are almost straight with a hair off. Any clue to why the strings feel stiff on the one??? Anything I need to check or is it just a stiff neck? Thanks for the help!!!