The trick when using RIMAs to facilitate orally ingested DMT or its carriers is to find the dose range that works for you without causing too much N+V. People vary a lot in this respect.
Ballpark "doses": ground rue seeds = @2-4grams, extracted rue harmalas = @150-250mg, B cappi vine = @50-150grams. I'm not familiar with B cappi extract dosing. Tregar may guide here. Moclobemide is rather effective with minimal side effects = @150-300mg.
Many would advise that B cappi delivers a subjectively superior aya/anahuasca experience. More visionary and dreamlike. Syrian rue has its own "flavor". Moclobemide seems relatively "sterile" but is a very effective RIMA. Additionally, the CNS effects of DMT and its cogeners also includes N+V, though generally not protracred. Ondansetron, lemon balm, peppermint or ginger may mitigate this.
Peace