I'm not sure about your MAOI dose cause I'm not quite clear on exactly what you have. I think 250mg harmalas is the amount averagely needed for MAO inhibition. I like to fast before I eat it. Pretty much if you just fast the day you take it, you should be fine. If you plan on taking it later at night, then I'd say to at least give it 3 hours beforehand of not eating. I would take the DMT 20 min after taking the MAOI. It's hard to say what a good dosage, and it seems that this is one of the more up-in-the-air numbers when it comes to dosages (such a great difference between what people normally like to take). Some find incredible experiences with 30mg while others need 200mg! Sensitivity varies greatly, and so to ere on the side of caution, I would start at 30mg for your first time and work your way up consequent times. If you take the 30mg and it ends up being too weak (and I would wait at least 2 hours before making this decision on the first time) you can always take a hit or two of vaped spice to knock the experience up to the next level. Mixing it with grapefruit juice would be a good idea too (should reduce nausea somewhat).
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb