I weigh about 165 lbs. I am thinking about going down a little on the shock spring rate. I have heard that the stock spring is for a 180 lb rider and it does seem that my sag settings are a little off for my weight. I get a lot of static sag (maybe 1.5") when I set up for 4" of loaded sag. Should I go down? If so, what is the stock rate, and what rate should I go to?