The more I learn, the less I know. Or I find with every answer comes two new questions.
Terpene/flavonoids peak occurs 2 weeks prior to THC peak. Which is what 99% of people use as a metric.
The entourage effect is drawn from terpenes not THC.
I've grown godfather og 35%+, I no longer even look or think about THC content. It's not what it's about for me.
When taking stock of trichome cloudiness one must take 3-4-5 looks at different areas of the plant,
What is good for terpenes is not necessarily good for THC.
Terpenes like myrecene can start to degrade above 67.
The choice of how and when is yours and up to you, but do not be so hard on yourself as to precisely when to harvest because quite honestly it comes down to preference
If you consider in nature what triggers flowering? Longer nights. Generally what comes with longer nights is cooler temps.
Heat, light, whatever radiation you choose will accelerate the decay cycle rapidly the higher doses you apply.
If your still fully focused on ppfd max temp 86F for the last two weeks of ripening and harvest at "peak THC" there will be little no smell.