I just booked mine at midnight on my 60th day this past weekend. I was able to get everything I wanted, although the system remains obtuse in that you have to select exactly the opposite times that you want and then move each FP one at a time. All in all, (using a tablet), I got 6 days worth of FPs adjusted to my liking in 18 minutes. My wife, who was lying next to me, said "This is nuts. How do any first timers get what they want?" So as long as you know to strike early, you will get everything you want. The next morning there was one FP that I wanted to tweak by half an hour and I could not as that time slot was gone. But times adjacent to that were available.
One thing that bothered me about my experience was that Touring Plans sent me an email in advance telling me when my time to book would commence. Good on them. Disney? They sent me an email on my 58th day out telling me that I could now book my FPs. Pretty lousy that TP gives me a better heads up than Disney.