Well, it looks like the Triple Sulfa and medicated food did the trick. The white edge is definately regrowth and is now grown out almost 1/4 of an inch. I took him off the Triple Sulfa a week ago but continued with the medicated food.
I am now going to slowly cut those in half to one meal of medicated food and one of regular pellets or bloodworms.
He was medicated for almost a month, well beyond the 6 day course they suggest on the packet. I think that is what helped. Stopping too soon allows the rot to gain a foothold again and come back even stronger.
I'm going to have to start Lava Jr on the Triple Sulfa too I think. His fins aren't getting shorter, but his rays are getting really thin and skimpy looking. Definately not as thick as they were. This could be some type of finrot as well. I've started him on the medicated food but he sometimes spits it out. The pieces are too big even when I try to choose the smallest ones. I think it is also harder than the pellets. He is such a big boy, the biggest I have, but he's such a dainty eater. He chews very slowly and sometimes vomits everything out if I try to feed a second piece before he's finished chewing. He also stubbornly refuses to eat peas or Daphnia or anything soaked in vitamins. :

He's the only one of my fish that won't eat peas OR Daphnia. Will have to try other veggies. I feed him very little to avoid constipation, sometimes only 3 pellets a day (in 3 separate meals) Maybe one day a week of fasting if he won't eat peas or anything.