The main thing about the X pattern is that you need a nice even stroke, making sure the blade stays flat on the stone and very little pressure. When you see more wear at either the spine or in the edge, uneven pressure during the stroke is the likely culprit. Frowns and flattened tips or heels usually do not come with an even stroke and usually show up when there has been way more honing done to a razor than is necessary. It would take a significant amount of use and honing to wear a frown into a blade with normal honing, no matter how wide the stone is. Like everything in this sport, it is all about feel and practice.
Have fun,
Lynn