I suggest first find the potency of your caapi, drink it by itself, around 40g.. If you can feel something, light headedness, maybe some tracers, sensitivity to light etc, its cool, next time add the dmt admixture.. If you dont feel anything, raise next time till you find that dosage. If its too much (very dizzy, etc), lower the caapi dosage.
Otherwise if your aya brew doesnt work well you wont know whether its dmt or caapi that is too much/too little.
Also chacruna depends which. Some are quite potent, at like 20g is plenty, but more commonly you might need 2 or 3 times that much