Steven,

It varies. Each material you use has a different weight. So at times a hook-eye too long is enough to cause it to list it one side. Other materials, a hook-eye long will cause it to fall on it's face. It can change pattern-to-pattern. Over time for a given pattern you nail it. The key after that is consistency.

Also remember with the tippet tension, the tippet size AND knot choice can change a flies stance on the water as well.