You should never flush an organic substrate that goes entirely against the idea of it. We don't buy flushed vegetables in the store, it's not a thing. If you go the mineral route, flushing prevents immense salt buildup but won't make your bud better. Proper drying and curing is where you can actually influence the buds taste and smell, backed by science.
I also grow organic and in the last two weeks I only feed light molasses with a bunch of vitamins and amino acids but never ever would I flush out my soil that I've been building all this time.