Did you ever hear of tiller? To measure this you take your bow square and set it against the inside of the limb where it meets the riser. Now read the measurement to the string. If you are using a release the top and bottom limbs should be the same, I think. If using fingers the top limb measurement should be about a quarter inch more. If you are as far out of whack as you claim, you should be experiencing some weird arrow flight for your bow is way out of tune. Using the two measurements to keep everything equal, adjust your screws til you get the poundage that suits you.