Assuming you've got the dosage right you could try doing basically the same thing but vape 20-40mg DMT 30 min or so after taking the harmala, instead of taking the salts orally.
I'm not an expert and don't understand why your attempt failed, but folks say doing it this way works! Planning on trying it myself ASAP.
No direction but to follow what you know,
No direction but a faith in her decision,
No direction but to never fight her flow,
No direction but to trust the final destination.