i was told that my new 450f is set up for 180-200 lb riders, and that i need new springs and revalving? i'm 160 lbs, novice rider. my problems are hard cornering, bike's all over the place in choppy stuff and washes out in high, sandy(silty) corners. last bike was a used crf450f with factory connection suspension (rider was approx. my weight but better rider). bike handled fine. i did switch out the front tire to a dunlop 952 and am running 13 psi in both. the bike does land well; i don't want to sacrifice that or really spend $700 plus in a pro-action suspension that i don't need? anyone help?