I've noticed in many spas that I've been in, the coping around the spa mimics the coping around the pool in that it hangs over the edge about an inch or so. So basically the coping sticks out over the wall and pokes you in the back when you're sitting in the spa and leaning against the wall. It seems like it would be better to make the coping line up with the wall so it's more comfortable to sit in the spa. Is there a reason to do it one way or the other?