Are you actually having a gelatinous scoby form in your tub?Yep. And it's just as likely they don't "taste" strong ferment as opposed to a light ferment unless someone is loading things down with additional ACV. A four day ferment is nothing much different than a 1 day ferment in terms of taste to a chicken, it just smells stronger to us, so I think people automatically assume it will be off putting to the chicken as well. I've dumped out scoby on the ground that was months and months old and stunk to high heaven and the chickens will come along and lick that stuff off the ground. They will scratch at that place and keep eating until all the grass is gone, in an attempt to eat that strong smelling scoby. They seem to enjoy it even more than their FF.
How often do you start over? I find the sludge starts getting a bit much!