By look and your description it sounds like your crop was overfed and still had a lot of fertilizer in the plants at the time of chop.
I'll throw a dart at the wall and guess that you used salt based fertilizers and or a bloom booster?
Cure and time will help break that down but I think you found the threshold of feeding for the strain.
Next grow, back off how much and how often you feed, cut feeding around week 6 of bloom, and let the ladies clear their plate at the end, almost to the brink of starvation.
A plant mobilizing nutes, mainly nitrogen from the lower regions to feed the upper regions is a good thing the closer you get to harvest. Temps and humidity will also play a role in food uptake so you want that dialed in as close to perfect as possible especially after week 6 so they eat up everything fed to them without burning.
You'll get them to exhaust all the ferts available and fade out into ripening greatly reducing the amount of chlorophyll left in the plant causing that grassy hay smell while at the same time amplifying terps that will give you that dank aroma.
The light change and training did play a role but that role was in how the plants fed. Environment also played it's part and the result was an overfed crop with food still left on the plate at harvest. If the smoke has a bitter metallic like taste to it, that's another sign it was overfed when alive