As I understand it the issue of whether the morph is dominant or not doesn't matter; the problem is that dual spider genes are not viable for life so that it never makes it past conception. For example every spider now has these genetics:

S = spider gene n = normal gene

existing spiders are all "Sn"
a spider with the genetics "SS" will never make it to birth

this would lead me to believe that a spider to spider breeding would give you 2/3 spiders and 1/3 normals.

P.S. All this information is just a guess, oddly enough nobody seems to want to fund a gene mapping program for ball pythons...... Just Wierd!

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