Also, we've found that d-limonene extracted material can equate to a longer lasting smoke as well and is generally smoother, although more hard work!
Recently, I had a lot of sessions with a guy on the couch over a few weeks, and he had a lot of powerful breakthrough experiences with 50%, but when we pulled out the 30% changa with freebase harmalas, it was too much for him and he never came back! He was scared away!
I think if you are going for full power - extracted harmalas may work very well. When we are talking almost all of the population, it may well be too much for them.
DMT is so powerful anyway, I should say the purpose of Changa in my eyes, is to make it as accessible, friendly and gentle as possible. You can do this by adding friendly and beneficial combination and ratios of herbs.
All of us who are experienced with DMT, know how extremely intense and ruthless DMT can be. Changa was originally designed to bring it back, slow it down and make it more like a smokeable Ayahuasca experience which is more relevant for people - rather than a hyperspatial blast.
I have felt that some have approached Changa as a way to make their DMT more potent, more powerful, with the Harmalas and 50% blends. But you guys are the elite, for the greater majority of the population, even most of us here, this is super powerful already! Its not a matter of trying to make the penis bigger! It is a matter of being a sensitive, aware, mature and (when necessary) gentle lover!
If you are making a 1:1/50% with extracted harmalas, well then it is generally a hyperspatial blast, but remember not everyone wants or needs this all the time. A lot of the old timers I know (who have been into Changa, since the early mid noughties) appreciate the value of a light and gentle smoke. There is so much medicinal and aesthetic value in that. Your Changa should be like a fine French meal. Part of that is sourcing local plants and using them for their flavour and qualities. Goodonya bricklaya for using the Mearnsii and Baileyana! I would use less myself, and more vine, as you don't need much of the admixtures for the aya to activate their unique qualities and effects.