Finally got the sub-hour. First off, the first two splits I skipped because I split too late on them. I made some pretty costly mistakes in the Somoro-Teh and Desert Thing splits, amounting to about 18 seconds. Then, the run exploded when I got a really fast fight going into Kax-Teh, followed by the best Kax-Teh fight I've ever done. It was constant time-saves from there on.
The run was anything but perfect, and with some more optimizations, I may be able to get a 55 or even a 54. But for now, I'm quite satisfied with this run.