Somehow the material you intended to use appears to be a little, how can i say, strange !
"Hawaiian Psychotria Virids" ? I realy never heared of a P. Viridis Strain that comes from Hawaii, as far as i know Psychotria Strains are only growing in South America - Amazon-Basin.
"5gm of 100:1 extract of Banisteriopsis Caapi" Somehow this reminds me on advertisings of Salvia Extracts, never encountered B. Caapi extracts so far! Sure it`s possible to do an Extraction of the Alkaloids B. Caapi contains.
To gain some idea how much you should use, i would try to finde out how much DMT P. Viridis contains (i think once i read 0,75 %) and then calculate the dmt for 250g p. viridis. Same i would do with the vine, find out how much harmala alkaloids are in B. Caapi, calculate it up to 5g * 100, then you should be able to do an guestimation ! The data you need should be found on erowid.
But anyway, where the heck you received this material under that Names ?
And before using, make sure it`s the real stuff !