is this what you’re using?
http://www.theoriginalresinator.com/category-s/234.htm
plant matter does get pretty brittle at those temps.
using in house analyics to figure out when (time wise) potency starts decreasing (ie kief was now being diluted with ground plant material) might help figure out the best way to use that critter.
are your rm temp EtOH kief extractions green?