I don't think you're doing anything wrong, 90 lbs in 5 months is phenomenal!!! You should be giving me advice!! But if you'd like to give us an idea of what you're eating, how much protein, carbs, water, I bet some of the vets would chime in with some suggestions. I have seen it said many times, the closer you get to goal, the slower the weight comes off.
I am impressed with your loss and the fact you lost with hardly any stalls!!! That is amazing to me, seems I stall more often than I lose. I would say right off the bat, just to get back to basics, protein first, then maybe some good carbs thrown in. Watch the junk, it really likes to sneak back in. Good luck!!