Was that 10 months as stock solution, or fully mixed and ready to go? Refrigerated and dark? Did you mix it up from dry chemicals, or was it purchased premixed? Sorry for the quiz, but I am still trying to figure out why my STS was so bloody toxic. One application produced more damage than your entire series did. I killed half a dozen plants trying to get this sorted, and I am still not sure whether the problem is my solution, the way I applied it, or both. I have tried spraying the whole plant, which killed all, spraying only the nodes, which reversed one and killed another, and have tried applying with a brush to nodes only, which caused toxicity, but seems to have at least partially reversed one, and likely reversed the other. My solution was mixed fresh as application solution, not stock, and was water clear when applied. One possibility is that the fresh solution was stronger than older stuff or pre-mixed kits that may have backed off on the concentration. OTOH, I may have screwed up the mixing, but I was extremely careful with that.
OTOH, the one successful reversal produced more pollen than most or all of my CS she-males combined did. Go figure.