Certainly predictions can be difficult and I've been wrong plenty but I wouldn't expect the axanthic or caramel pieds to be extremely high white. Of course hind sight is 20/20 and I hadn't really even thought about the spider pied but now it makes since that a reduced pattern white belly snake would have made a high white pied. Maybe pattern starts on the top of the back and works it's way down and both spider and pied impede that progress so spider and pied together stop it at the head? Wonder what the spider het pieds looked like, maybe you don't even need a homozygous pied to reliably kick that project off. Perhaps axanthic has a bit of a pattern element to it but I really think of both axanthic and caramel as more of color mutations so I would not expect either to change the average amount of pied area in the pied combo. Maybe woma or pinstripe or even genetic stripe would make high white pieds like spider. Interesting that white belly pastel didn't seem to increase the white in pied (has there been more than one yet?) but in some cases the double hets (pastel het pied) seem to show interaction between the pied and pastel genes.