I'd recommend doing
gibran's easy caapi tek to get the alks out.
Once you've got the dry alks I believe the standard ratio is ~450mg of harmalas : 1g of dmt : 1g of leaf.
Using the extracted alks in this manner, you don't have to use caapi leaves as the base herb but it is still traditional.
This way you know exactly how potent your changa is and you can adjust the ratios to taste.
On a side note, I also believe that doing gibran's tek is far more effective than soaking caapi in a solvent for weeks at a time. (more in response to
your other post) When soaking the caapi, you don't know if you got all of the alks out. Using gibran's method, you know for sure.
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