If you are sittin at around 60 lbs now,just crank on the limb bolts clockwise all the way.Make sure both limbs are touching the limb pockets.Your bow will be maxed out at roughly 70 lbs,give or take a few pounds.
Check your tiller on both limbs and tighten or loosen each limb bolt untill top and bottom is even.
All this assuming your bow is a 60-70 lb model