With all due respect to your personal experiences, some of us post according to the latest recommendations by the experienced keepers on the "org".
Dropping the temperature is to lessen the chances of bacterial infestation, or at least to minimize it.
You can drop the temperature 2° per day, a little more if spread out throughout the day, and the seahorses will be fine.
Bio-Bandage has never been "too heavy" for my seahorses, nor for many others reporting on the "org".
Keeping the seahorse well fed is definitely a parameter, although target feeding is only necessary if it doesn't feed enough in the normal manner.
Maintaining good water parameters is a necessity at all times, IMO.
It has been a long time since this post originated and we haven't heard back from the OP on the status, but if he posted that the problem was exacerbated, then followup treatment would have been recommended.