I would do this with my previous MHRB extractions.
A lot of tecs suggest to apply heat at the end to draw out more materials from the bark, but I reverse this, instead doing it at the beginning and working my pulls while the whole mixture is warm. You still get a good result and are absolutely certain you're drawing out as many alkaloids as possible.
Hope this helps!
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"You will not be punished for your anger, you will be punished by your anger." -Buddha
"I must not fear. Fear is the mind killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when my fear is gone I will turn and face fear's path, and only I will remain." -Paul Atreides, while being tested with the Gom Jabbar by the Reverend Mother Gaius Helen Mohiam