twist the Power harness until you have youe draw weight back where it was, this will bring the draw length back to its original length.
Not exactly. Shortening the cable will increase the drawlength, but not necessarily to where it was originally. The string may or may not have stretched and when it does, it normally stretches more then the cable. The string is likely to also need some twists to get back to the original drawlength, but you will only know by measuring.