Very impressive change over 12 weeks, major congrats to you!
I might suggest don't try to go too low carb, keep in the tubers (sweet potato, squash, root veg, and yes, even white potato *gasp*) and perhaps the sugar demon won't have such a need to rear its ugly head. You do need some good carbs if you're needing to fuel heavy workouts. And some fruit can go a long way to curbing the sweet tooth, this is the perfect time of year for all the seasonal goodness.
You can do this, as you've already seen in the past few months.