As for what I did differently, well, at the beginning of June, I took a week off working out (Doctor's orders! Really! It didn't take much to convince me, though). I think it genuinely helped though; I was able to lift noticeably more the next week. I've also switched over to an A-B-A routine, rather than doing the same thing 3 times a week, and I think that was a good move too. Sadly, my gym seems to not be running the personal training special that I'd heard they would, so I may still be on my own for a while yet.
Overall, though, my stamina is up (oooo, forgot to plot my endurance numbers, which I have from the beginning of the year), and I'm looking and feeling better. So, I'm calling it a success!