My 2007 WR450 is currently running stock suspension, I run anywhere from 210-220 lbs. My front end is feeling heavy and after watching some video of me riding I realize that 1. I'm too heavy for stock suspension(duh!!) and 2. I guess these springs get tired after a few years so repring time...I go to the Race Tech calculator and enter my particulars and it produces the following numbers front spring rate .489Kg and Rear rate of 5.9Kg so should I round up or down based on these numbers...is there a rule of thumb for this situation??