That sounds like my acne. It's so annoying how after 1 pimple clears another forms. It's ridiculous. That is amazing that you have cleared your acne so much and is a great accomplishment to have done that by yourself with dietary changes. I have done the same thing and it has taken months or research and experimentation.
I've been researching since last august, that was my first picture in my "Final regimen" gallery, so I know how you feel. I couldn't have done it by myself of course... I must have gone through weeks and weeks of posts on these forums, most of which pointing to the same thing (Mostly Paleo diet, no dairy, good food, etc.). But I'm not counting my chickens before they hatch... I tend to go at least one or two years without any cysts before celebrating. I'm hoping to bring my acne down as much as possibly through my diet, THEN add in other things if necessary, such as supplements. The less I need the less money I spend. I've seen your pictures too, you're really not that bad looking! And your acne is not as sever as I would have thought (and you should read your picture's comments ).
The way I look at it, most people can get clear from omitting dairy/sugar and refined carbs. There are some unfortunate souls (I am one of them), who have to have a flawless diet to be 70-80% clear
There's also the time frame of your body adjusting don't forget. I'm about where you are right now, 70-80%, but I'm still screwing around with foods that I probably should be eating (peanut butter, extra fruit, etc...) To the people who had avoided dairy first (it was the first thing they tried), they ended up waiting at least a year until their hormones went back to normal and their acne stopped producing all that puss. And that's from dairy alone. Growing up with these foods will take maybe a quarter as long to filter out... it depends on the individual. Some spots I have now under my neck are STILL from my original cysts LAST YEAR. It takes time to clear out all the crud, but as long as you see an overall improvement then you should be ok. Take things one step at a time and do as many good things at once as you possibly can. That's what I and the majority of some of my friends have been doing (not on acne.org).