Making hooch may be different than making beer and wine.
That is a high temperature, even for baker's yeast fermentation. Not too different from beer yeast, and most do better 62-65, and produce off flavors and higher alcohols with fast fermentation at 74-77. Entirely possible it is just done and not fermenting any more. Foaming when you add sugar doesn't mean anything, likely just off gassing due to nucleation points.
You started with a gravity of about 1.046 if the sugar and juice with water added was in 5 gallons total volume. Check the gravity and it should be very low ~1.000 if finished fermenting.
I'm guessing you are going to dis**ll this with a recipe like this. Doubt it will taste good, but I hope it turns out for you.