A little more info would be nice. Did you change anything that the bow would be different, such as the string and cables? Either way, to maintain the present drawlength and gain the weight you have to twist the string and the cable, thus putting more prestress on the limbs. Normally you have to put about twice as many twists in the string as the cable. Good way to know is to mark the cam where it passes through the bottom limb so you have a reference for drawlength.