I've heard that with the technological advances in the last ten years to strings and cables, we shouldn't be twisting them because they wear out faster. I was also told the proper way to adjust your bow was to loosen or tighten your limb bolts.
My bow was set at 64 lbs. at the factory and I'm up to 72 now, and I tightened my limb bolts to do it. Didn't have to take my string off or anything, just put a wrench on it and turned both bolts the same amount, then drew the string back and made sure both cams stopped at the same time.
It was easy!