I'm fairly new to ball python genetics and I believe it's safe to say it far more complicated than I expected lol!
Anyway, on the topic of homozygous spiders... I've played around with just percentage points on potential genetic outcomes and can never seem to get more than a 25% overall chance of producing any spider morph that is homozygous. Granted this 25% is theoretical and simply on paper things seem to change a fair bit in real life practice though. I have however found a coupling that produces potential for many awesome spiders if it worked. If I had 2 mahogany cinnabees you even have chances of homozygous super cinnamon spiders. I'd like to see that since super cinnamon is solid black and I'm not certain what spider would do to that.
I've torn through many different pairings but this seems to be one of my favorites as far as high variance in offspring.