weirdly enough, i find i get the most out of underwhelminghumans. sucking whatever negative traits I can get out of xenotypes and slapping them on pawns where the downsides don't really bug them means less food consumption. I once made some badass superhumans that never slept with nuclear stomachs to return their consumption to neutral, but a bunch of regular dudes bad at planting has been way more practical and easy to set up.