Once you have gotten the fundamentals of delivering a power lead hook strike move on to the power rear hook technique. The rear hook offers a massive shock wave and should be delivered at a range that doesn't require you to cover linear distance. you should be practcing the strike from close ranges by using maximal rotation and some lateral weight transfer, either by inclination or a lateral step. Again remeber to focus on the recovery of your balance and landing of the strike. Remember circualr strikes are much moer telegraphic in nature and also more comimited once in motion. Often many fighters are so focused on landing a massive power strike only, and forget to recover if they miss, which often puts their bodies out of position allowing them to get countered easliy. Don't get in the habit of throwing an artless haymkaer that has no specific direction or intention.