I would do the same with harmine only.
Lesser the dosage with harmaline only.
However I've never found incidence with harmalas dosage although too low wouldn't feel quite like changa ...
1/3 or 1/4 spice harmalas (depending if harmine, caapi mix alcaloids or harmaline, rue mix alcaloids are used).
Smell like tea n,n spirit !
Toke the toke, and walk the walk !