There are lot's of factors involved. Not just your honing, but the condition of the blade. You'll find many blades are far from perfect. The difference is experience. An experienced honer can make up for it.

You can most definitely add some pressure while honing to a shallow spot in your bevel. If one side of the bevel is not existent, and the other side very pronounced, you can add strokes to non existent side. Glen shows this in one of his videos.

Honestly, your talking cosmetics most of the time. The shave is what matter's most. If your getting good shaves, I wouldn't worry too much about the bevel not being perfect.