Sorry to read about the losses, I wish I would have read this thread before you actually started the treatment, I would have liked to share with you some of my own experiences with both treatments.
You are absolutely right on the money, fluke tabs alone will not kill the AEFW, it does however do a good job at stunning them and making them fall off the coral with the aid of a power head, this same power head is the one that kills them, I have done many different test on flatworms, the most interesting observation is how fragile their body structure really is, a slight pressure with your finger and they disintegrate, that's why I believe that the initial experiments done with the fluke tabs people reported that they will die and disappear when they weren't really dying but instead being caught on the PH propellers and shredded to pieces.
Others like me noticed that the FW were not dying, but, I was not using the power heads cause I was curious to see the critters die, when I did test with a power head I couldn't even find traces of the critters.
IME you will continue to get more casualties of the survivor corals due to zooxanthellae dying of after levamisol treatment, they will first loose the brown color but still be alive and then slowly perish, hopefully some coral will be more resilient to this or will recuperate their host algae quicker.
One thing is for sure, fluke tabs does not kill the zooxanthellae, levamisole does.
In the meantime we can just continue to try different things until we find a safe cure, I commend you and thank you for your efforts and sharing of your experiences.