this subject was discussed on more than one thread and i am sure you can find some relevant stuff
anyways... i am no expert but the popular ratios i am aware of are 2:1 and 3:1 ( spice:maoi with enough leaf material to absorb the alks) there are others though who use very little harmalas.
i assume that for practical purposes a full spectrum fb from caapi can be treated the same as any other harmala.
best is to experiment and find what works for you. start with higher ratio and add more harmalas till you find your "spot".
hope it helps
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