Breeding a normal x butter would give you more normals and more butters. Each egg has a 50% chance of being a normal or a butter.
Neither sexes genetics are more important. As far as I know there is only one possibly sex linked mutation in ball pythons (I believe its the banana, I heard about it on one of the reptile radio episodes). Other than that it doesn't matter which parent has which genes.
I'm also going to say that breeding any morph female to a normal male is a waste. Male morphs are so cheap that it would be worth it to just get a morph (even a pastel) and breed it to the female for the chance of hitting the combo.