Congrats on the harvest (glad it was ready to come down), but such a pain in the ass about the mites.
SNS 209 is a completely different concentration than their mite killing spray (217c), even though 209 says:
"209 repels and kills spider mites, broad mites, russet mites"
The active ingredient in 209 is:
Rosemary………………………………10.23%
and the recommended ratio is:
Foliar Spray: Mix 1oz. per gallon of water
The active ingredient in their 217c spider mite killer is:
Rosemary………………………………10.00% [basically the same]
but their recommended ratio is:
Mix 21 oz. of concentrate per gallon of water. For best results use warm (70 degrees F) Distilled or “Chlorine Free” water.
That's 21x more potent in the final spray than the 209 when mixed to directions.