I don't think it matters which morph is which sex for the individual combos. But if you're looking at both bees and blasts...then I'd recommend a male pastel and female spider and pin. That way you can cover both the spider and pin with the same pastel male in one breeding season and give yourself a chance to produce both combos in the same season with the least number of breeders. And if I were to go this route, I might go for a super pastel male to start with...that way all the babies he throws will at least be pastel, and give you a higher percent chance of hitting the combos.