I have a 07 DRZ400s and weigh 230lbs. Looking to re-spring the front forks with racetech springs. According to their website using the calc, I should get a .50kg spring. The bike has 200mi, would it be necesary to re-valve the forks? Also, going to re-spring the rear. The recommended 5.86kg. Should I choose the 5.7 or 6.0? Thanks for the help.