Pick up a DPMS SASS, 18" bull barrel, magpul stock, JP trigger, etc. Took it to the range, shoots well but the trigger sucks. Brought it home threw the gage on it and it breaks at 5 pounds. Ordered the 3.5 pound JP trigger spring kit from midway. After I broke it down, I polished the contact surfaces, and adjusted the set screws according to the instructions and on line video. Instruction recommend the red hammer spring for the .308, so I left it and replace the yellow trigger spring with the new yellow trigger spring that came in the kit. It now breaks at 4.5 pounds. :-( Any suggestions, short of replacing the trigger unit?