Not sure about your caapi extract, but as for the DMT, I would pick a starting dosage between 50-75mg for your first time. People's sensitivities to pharma range practically unrivaled. There's no telling why some are more sensitive to pharma than others which doesn't seem to have to do with weight and doesn't reflect sensitivity to other routes of administration. For one 150lb man, 50mg DMT could be overwhelming and for another 150lb man, 200mg may create the same level and intensity of experience. Getting in over your head with pharma can be quite unsettling, so it's best to play it safe and start on the lower end of the spectrum to find out where you lie. Assuming your MAOI works, you can always simply drink some more DMT later, or you can do what I like to do which is to smoke a small dose of DMT. This is practically guaranteed to kick things up to the next seven levels for about an hour or so. Once the hour is up, if you feel like you could go again, just take another rip or two, or if you've feel like you've had enough, you can just sit back and ride out the rest of your pharma experience. This method makes it rather easy to dose with pharma because it's orally so unpredictable that there are inevitably tons of misfires and underdoses - most of which can easily be fixed by smoking a little DMT. Be careful though, smoking DMT on pharma may very likely be the most powerful experience you'll ever come across.