Antrocles - I have a question for you: since you seem to be drinking a strong aya brew, are you also following a diet and/or making other physical and mental preperations before and after you drink? I had a couple of deep caapi-only experiences earlier last year, which I am thinking of repeating, only this time with some changa and bufo at hand to bring some light into the experience when I feel ready.
The prohibitive factor for me is that I like to give the Vine its due respect, by following a diet prior and after the experience, this is not only food but also social interaction, work, etc. Also being as fully attentive as possible while brewing. This usually means 2-3 days need to be set aside for the experience. I'm interested to hear other's views on this.