Depends on the bow too. My elites tends to alter the DL when I change the DW. Lower draw weight extends DL a bit, and raising the DW decreases it a bit. I was a bit too long on my Victory and turned the weight all the way up. I can feel that it's shorter, but still need a bit more. If you don't turn the bolts the same amount it can effect tiller and cam timing. Knock point change could be from getting the bolts slightly off on the turn, one more than the other. The re sighting is from increasing or decreasing speed with DW.