Again a couple of thoughts occur: 1) you’re greatly discounting the effects of epigenetics on development and trait expressiveness, so even if you tailor for everything as you wish, you’re still only going to guarantee outcomes in a certain range, and 2) heritability is population-level, not individual level. So a figure like “80%” means that that much variation in intelligence in a given *population* is associated with genetic variation. This does NOT mean that 80% of a person’s intelligence comes from their genes. 3) you’re also completely neglecting the effects of genetic nuture, besides environmental effects.