The manual says that the rear shock comes pre-set in the #4 position. I am approximately 235 lbs. I frequently ride with my wife as a passenger as well. Lets say that adds another 120 lbs for a total of 355 lbs. We ride mostly on the highway that are for the most parts smooth, with the exception of some that are a bit rougher due to patching and poor crack tarring. I think I could get a bit better ride than I am now with some minor adjustments to the pre-load on the rear shock. What position would everyone recommend adjusting it to?