Ratios in traditional Thai peanut curry recipes
Many Asian recipes, especially from the Thailand have large amounts of sugar in them.

Traditionally this would have been a more raw form of sugar, or just some sweet fruit paste

I would suggest first trying the original Asian dishes (i.e. go bush in Thailand, or find some recent Thai immigrants to hang with!), and then make you own sauces based on those experiences, but adjust ingredients to taste and sensibility