it's all personal preference, but I actually expose APX100 @ EI 50, and then develop in Rodinal 1+50 for 8 minutes. Why do I overexpose one stop? I like the look of it, and I thought I'd throw you that option as well. It will, if nothing else, reduce your developing time. I find it extremely tedious to develop film for 15-17 minutes at N.

I have also heard people say that underexposed 2 stops, APX100 will look similar to APX400 at N. I don't know about that, but it indicates that this film has tremendous latitude, and that if anything encourages experiments.

Good luck! I think you'll like the APX100, it's a wonderful film.

- Thomas