Huge props to @Indra for helping spread knowledge and being helpful.
Parting with hard won knowledge can be a tough thing to do, but should be rewarded with encouragement and the sharing of our hard won knowledge when it will be helpful to others! #PayItForward
On to my contributions!
I've tried doing the quick wash with frozen isopropyl alcohol to extract, then allowed one batch to evaporate at room temperature (taking 5 days) and one batch was evaporated in the oven at 170°F (the lowest my stove would go) for a few hours. Both batches came out very brown and appeared oxidized with none of the monoterpenes intact.
Each was mixed with various concentrations of Poly Ethylene Glycol 400 and vegetable glycerin. Neither one tasted good or smoked well out of a cotton wicked vaporizer.
Then I discovered c-cell cartridges that use ceramic and don't require a thinning agent!!!
I still don't have a good method for extracting clean concentrates while maintaining all the monoterpenes, but I'm interested in learning.
I have done rosin pressing, which provided clean concentrates, but I believe there is probably a better way to do at home extractions.
[I have a BS in biology, with too many years in chemistry labs, so I have a strong basis to start with, but little expertise in cannabinoid/terpene specific physical chemistry. Oh, and I vape nicotine and vegetable glycerin with no flavorants, as they have been linked to health issues.]