As a new or potiental J shape head you probably won't fully understand how they actually may look on you. To begin this process we recommend looking into a mirror and adjusting your stacks that way.
LESSON #1 YOUR STACKS START AT THE KNEE DOWN. Distribute the fabric evenly from knee down to your ankles as much as possible. Cheat code: A high top boot or sneaker will create a balance to your fit.
As seen in the image below, a hightop sneaker or boot will push the jean up allowing for more stacks at the calves. Try tucking the leg opening into the shoe to secure your stacks all day long without having to fix them. That's the AK way to maximize your stacking.