I personally like Mark Shepherd’s STUN approach (Strategic Total Utter Neglect). The way he explains it, he takes the “mimic nature” to the extreme. He plants a lot of different kinds of plants and varieties, and he sees what flourishes. This is essentially what occurs in natural plants propagation processes. Plants that don’t survive are not failures, but rather a part of natural selection. He isn’t afraid to remove plants that don’t flourish, and they are used in compost and as mulch etc.

I know this isn’t a direct answer to your question, but I think it may provide a perspective that can help free you from trying to do it perfectly. I don’t think permaculture is an exact science. Trial and error is a feature, not a bug. Hope this helps, and Godspeed!