I love that spider! I'm glad some of them made it! They had a rough start that's for sure!
If the last one doesn't poke is head out soon I would be temped to pull his head out myself. That's what I did with my clutch last year once they got to day 58. I figured something was wrong with them otherwise I might not have-plus that's the advice I got at the time (they were all deformed). If the rest of your babes are crawling out, the last one should be poking his head out-at least you would think so. I'm just nervous that something is wrong with him since they did have some incubation issues, he may not be poking his head out because of that. I'm not sure how long I would give him though, someone more experienced needs to chime in on that, but I personally wouldn't let him get past day 60. Don't pull him out of the egg, just make a little hole and pull his head out if you can.