RE: adjusting draw weight on hoyt bow
Not sure why loosening one of the side screws effected the other, as far as I know, they are not connected. I always have to loosen and tighten both.
As for turning 3 turns and getting lighter, something is wrong. If you are tightening the limb bolt (turning clockwise) it should raise the weight. Check the amount of space between the limb pocket and the riser, as you tighten the limb bolt the pocket should get closer to the riser. If not, you're going the wrong way.