Hey There-- sorry to hear of both of your continued struggles.
I am currently about 18 weeks post op and the incision has slowly and gradually been healing, probably about 65-70% of the way there. Also, the fissure is probably about 95% healed... I have to say that I am in a much better place then I was when I initially joined the forum.
It turned out that the reason for my slow/lack of healing was due to an underlying condition-- crohns
Not sure how much you were able to read on some of my previous posts, but I was having difficulty with excessive diarrhea and the poor bathroom habits.. add that in with a weak immune system from the crohns and you get a slow recovery. I was diagnosed a few weeks ago, and its been a rough ride... but time and good medicine heals all.
As for advice-- You should do some googling on chronic wounds, there is a lot of information out there on why these things happen. Also, if you haven't been already.. you might want to get tested for an auto-immune disorder. I know its scary... and probably not likely that you'd have one, but better safe than sorry!