A 100% het pied x 100% het lavender will produce animals that are 50% possible het for both genes. Statistically speaking, only 1/4 (25%) of the hets produced will actually be carrying the gene.
I recommend at least using a visual pied, so you can increase each animal's chance of being a true double het to 50%.
... But if you can't afford that, the best strategy is to make as many female possible double hets as you can, hold those back, and then purchase a 100% x 100% guaranteed double het male. (Guaranteed double het dreamsicle males are still expensive, but nothing like the double het females.). It's very difficult to prove out possible het females with a possible het male.
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